NZ625509B2 - Three dimensional virtual and augmented reality display system - Google Patents

Abstract

Disclosed is a three-dimensional image visualization system. The system comprises a selectively transparent projection device (56), an occlusion mask device (54) and a zone plate diffraction patterning device (52). The selectively transparent projection device (56) projects an image toward an eye of a viewer from a projection device position in space relative to the eye of the viewer. The projection device is capable of assuming a substantially transparent state when no image is projected. The occlusion mask device (54) is coupled to the projection device and configured to selectively block light traveling toward the eye from one or more positions opposite of the projection device from the eye of the viewer in an occluding pattern correlated with the image projected by the projection device. The zone plate diffraction patterning device (52) interposed between the eye of the viewer and the projection device and configured to cause light from the projection device to pass through a diffraction pattern having a selectable geometry as it travels to the eye and enter the eye with a simulated focal distance from the eye based at least in part upon the selectable geometry of the diffraction pattern. a viewer from a projection device position in space relative to the eye of the viewer. The projection device is capable of assuming a substantially transparent state when no image is projected. The occlusion mask device (54) is coupled to the projection device and configured to selectively block light traveling toward the eye from one or more positions opposite of the projection device from the eye of the viewer in an occluding pattern correlated with the image projected by the projection device. The zone plate diffraction patterning device (52) interposed between the eye of the viewer and the projection device and configured to cause light from the projection device to pass through a diffraction pattern having a selectable geometry as it travels to the eye and enter the eye with a simulated focal distance from the eye based at least in part upon the selectable geometry of the diffraction pattern.

Description

/000560 THREE DIMENSIONAL VIRTUAL AND AUGMENTED REALITY DISPLAY SYSTEM D APPLICATION DATA The present application claims the benefit under 35 U.S.C. § 119 to U.S. Provisional Applications Serial No. 61/563,403 filed November .23, 2011. The foregoing application is hereby incorporated by reference into the present application in its entirety.

FIELD OF THE INVENTION The present invention relates to virtual reality and augmented y imaging and visualization systems.

- BACKGROUND In order for a 3D display to produce a true sensation of depth, and more specifically, a simulated sensation of surface depth, it is desirable for each point in the y's visual field to generate the accommodative response corresponding to its virtual depth. If the accommodative response to a display point does not correspond to the virtual depth of that point, as determined by the lar depth cues of convergence and stereopsis, the human eye may experience an accommodation conflict, resulting in unstable imaging, harmful eye strain, hes, and, in the absence of odation information, almost a complete lack of surface depth. Referring to Figure 1, an augmented reality scenario (8) is depicted with views to the user of actual objects within the user's reality, such as landscaping items including a te stage object (1120) in a park setting, and also views of virtual objects added into the view to produce the nted” reality view; here a robot statue (1110) is shown virtually standing upon the stage object (1120), and a bee character (2) is shown flying in the airspace near the user's head. Preferably the ted reality system is 3-D capable, in which case it provides the user with the perception that the statue (1110) is standing on the stage , and that the bee character (2) is flying close to the user's head. This perception may be greatly enhanced by ing visual accommodation cues to the user's eye and brain that the virtual objects (2, 1110) have different depths of focus, and that the depth of focus or focal radii for the robot statue (1110) is approximately the same as that for the stage (1120). Conventional stereoscopic 3—D simulation display systems, such as that depicted in Figure 2, typically have two displays (74, 76), one for each eye, at a fixed radial focal distance (10). As stated above, this conventional technology misses many of the valuable cues utilized by the human eye and brain to detect and interpret depth in three dimensions, including the accommodation cue, which is associated with the eye's repositioning of the lline lens within the eye complex to reach a different depth of focus with the eye. There is a need for an accommodation accurate display system which takes into account the accommodation aspects of the human eye/brain image processing complex.

W0 2013/077895 SUMMARY One embodiment is directed to a three-dimensional image visualization , comprising a selectively arent projection device for ting an image toward an eye of a viewer from a projection device position in space relative to the eye of the viewer, the projection device being e of assuming a substantially transparent state when no image is projected; an occlusion mask device coupled to the tion device and configured to selectively block light traveling toward the eye from one or more positions opposite of the projection device from the eye of the viewer in an occluding pattern correlated with the image ted by the projection device; and a zone plate diffraction patterning device interposed between the eye of the viewer and the projection device and configured to cause light from the projection device to pass through a diffraction pattern having a selectable geometry as it travels to the eye and enter the eye with a simulated focal distance from the eye based at least in part upon the selectable geometry of the diffraction pattern. The system further may comprise a controller operatively coupled to the projection device, occlusion mask , and the zone plate diffraction patterning device and configured to coordinate projection of the image and associated occluding pattern, as well as interposition of the diffraction pattern at the selectable geometry. The controller may comprise a microprocessor. The projection device may comprise a substantially planar transparent digital display substantially occupying a display plane. The display plane may be oriented substantially dicularly from a visual axis of the eye of the viewer. The substantially planar transparent digital 2012/000560 display may comprise a liquid crystal display. The substantially planar transparent digital display may comprise an organic light emitting diode display. The projection device may be configured to project the image toward the eye in a collimated form such that the depth of focus for the eye of the viewer is an infinite depth of focus. The projection device may comprise a high—speed mini—projector coupled to a substrate— guided delay exit pupil expander device configured to expand the size of the image before delivery to the eye of the viewer. The mini—projector may be mounted substantially perpendicularly to a visual axis of the eye of the viewer, and wherein the substrate- guided delay exit pupil expander device is configured to receive the image from the mini—projector and r it to the zone plate diffraction patterning device and to the eye of the viewer in the expanded size with an ation substantially aligned with the visual axis of the eye. The zone plate diffraction patterning device and tion device may comprise at least one Common structure. The zone plate diffraction patterning device may be integrated into a waveguide, such that the tion device comprises a high—speed mini-projector coupled to the waveguide and configured pass the image through the diffraction pattern before the image exits the waveguide en route to the eye of the viewer. The rojector may be mounted substantially perpendicularly to a visual axis of the eye of the viewer, and the waveguide may be ured to receive the image from the rojector and deliver it to the eye of the viewer in an expanded size with an orientation substantially aligned with the visual axis of the eye. The occlusion mask device my se a display configured to either occlude or pass light at each of a plurality of portions of the display, depending upon a pertinent command to occlude or pass WO 77895 PCT/U82012/000560 light at each portion. The occlusion mask device may comprise one or more liquid crystal displays. The zone plate diffraction patterning device may se a high—frequency binary display ured to either occlude or pass light at each of a plurality of portions of the display, depending upon a pertinent command to occlude or pass light at each portion. The zone plate diffraction patterning device may have a refresh rate of between about 500Hz and about 2,000Hz. The zone plate diffraction patterning device may have a refresh rate of about 720Hz. The controller may be configured to operate the projection device and occlusion mask device at between about 30 and about 60 frames per second, and to operate the zone plate ction patterning device to digitally display up to about 12 different diffraction patterns for each frame of the projection device and occlusion mask device. The projection , occlusion mask device, and the zone plate diffraction patterning device collectively may comprise an imaging module for a single eye of the viewer, and the system further may comprise a second imaging module for another eye of the viewer.

W0 77895 PCT/U82012/000560 BRIEF DESCRIPTION OF THE GS Figure 1 depicts an illustration of an augmented reality scenario with certain virtual reality objects, and certain actual reality objects viewed by a person.

Figure 2 illustrates a conventional stereoscopy system to simulate three—dimensional imaging for the user.

Figures 3A and 3B illustrate aspects of an accommodation accurate display configuration.

Figures 4A~4C illustrate relationships between radius of curvature and focal radius. s 5-6C rate aspects of diffraction gratings as applied to the subject configurations.

Figures 7A—7C illustrate three different focal isms.

Figure 7D illustrates a Fresnel zone plate.

Figures 8A—8C illustrate various aspects of ction system focusing issues.

Figure 9 illustrates one embodiment of a waveguide with embedded diffraction grating.

Figure 10 illustrates one embodiment of a waveguide with embedded diffraction grating designed to allow one mode to escape and the other modes to remain trapped in the waveguide.

W0 2013/077895 2012/000560 Figures llA-llB illustrate aspects of a diffractive imaging module embodiment.

Figures B illustrate aspects of a diffractive imaging module embodiment.

Figures l3A-l3B illustrate aspects of a diffractive imaging module embodiment.

DETAILED DESCRIPTION Referring to Figures 3A and 3B, various aspects of an AAD system are depicted. Referring to Figure 3A, a simple illustration shows that in the place of two conventional ys as in stereosc0py (Figure 2), two x images, one for each eye, with various radial focal depths (12) for various aspects (14) of each image may be utilized to provide each eye with the perception of three dimensional depth layering within the perceived image.

Referring to Figure 3B, we have determined that the typical human eye is able to interpret approximately 12 layers s Ll—L12 in Figure 3B — drawing element 16) of depth based upon radial distance. A near field limit (78) of about 0.25 meters is about the closest depth of focus; a eld limit (80) of about 3 meters means that any item farther than about 3 meters from the human eye receives infinite focus. The layers of focus get more and more thin as one gets closer to the eye; in other words, the eye is able to perceive differences in focal distance that are quite small relatively close to the eye, and this effect dissipates as objects fall farther away from the eye, as shown in Figure 3B. t 82 illustrates that at an infinite object location, a depth of focus / ic spacing value is about 1/3 diopters. One other way of describing the import of Figure 3B: there are about twelve focal planes between the eye of the user and infinity.

These focal planes, and the data within the depicted relationships, may be utilized to position virtual elements within an augmented reality scenario for a user's viewing, because the human eye is constantly sweeping around to utilize the focal planes to perceive depth.

\Interwoven\NRPonbl\DCC\LGL\7389735_l.docx-27101/2015 Referring to Figures 4A—4C, if K(R) is a dynamic parameter for curvature equal to l/R, where R is the focal radius of an item relative to a surface, then with sing radius (R3, to R2, up to R1), you have decreasing K(R). The light field produced by a point has a spherical curvature, which is a function of how far away the point is from the eye of the user.

This relationship may also be utilized for AAD systems.

Referring to Figure 5, a conventional diffraction grating (22) is shown, with light passing through the grating spacing (18) at an angle (theta — 20) which is related to the diffraction order (n), spatial frequency, and R factor, which equals l/d, using the following equation: d*sin(theta)=n*wavelength (or atively substituting the K factor, sin(theta) = n*wavelength*K. Figures 6A—6C illustrate that with decreased spacing (18, 28, 30) in the ction pattern (22, 24, 26), the angle (20, 32, 34) becomes greater.

Referring to Figures 7A—7C, three different focusing mechanisms are depicted — refraction through a lens (36), reflection with a curved mirror (38), and ction with a Fresnel zone plate (40), also shown in Figure 7D (40).

Referring to Figure 8A, a simplified version of ction is shown to illustrate that an N=—l mode could correspond to a virtual image; an N=+l mode could correspond to a real image, and an N=0 mode could correspond to a d—at — infinity image. These images could be confusing to the human eye and brain, and particularly problematic if all focused on— axis, as shown in Figure 8B. Referring to Figure 8C, an off— axis focus configuration may be utilized to allow for blocking of modes/images that are unwanted. For example, a collimated (r = ty) image may be formed by the N=0 mode; a divergent virtual image may be formed by the N=—l mode; and a convergent image may be formed by the N=+l mode. The difference in spatial on of these modes/images and their trajectories allows for filtering out or separation to prevent the aforementioned problems associated with diffraction g, such as overlaying, ghosting, and "multiple exposure" perception Referring to Figure 9, a waveguide is shown having an embedded diffraction grating; such waveguides are available, »for example, from suppliers such as BAE Systems PLC of London, U.K. and may be utilized to intake an image from the left of Figure 9 as shown, pass the image through the embedded diffraction grating (44), and pass the resultant image out at an angle (in Figure 9, for example, through the side of the waveguide). Thus a dual use of redirection and diffraction may be ed with such an element. Indeed, off—axis focal techniques, such as those described in reference to Figure 8C, may be combined with diffraction ide elements such as that shown in Figure 9 to result in a configuration such as that shown in Figure 10, wherein not only are redirection and diffraction accomplished, but also filtering, since in the depicted embodiment the geometry of the diffracting ide is such that the N=—l mode (say the virtual image) is passed out of the waveguide and into the eye of the user, and the other two modes (N=0 and N=+l) are trapped inside of the waveguide by reflection.

Referring to Figures llA—13C, the aforementioned concepts are put into play with various ted reality display configurations.

Referring to Figure 11A, an AAD system comprises an imaging module (46, 48) in front of each eye (4, 6) through which the user sees the world. Figure 11B illustrates a larger view of H:\lgl\[ntelw0venWRPonbl\DCC\LGL\7389735_l.docx-27J01l2015 the module (46) with its ated (coupled via the depicted electronic control leads; leads may also be wireless) controller (66), which may be a rocessor, microcontroller, field programmable gate array (FPGA), application specific integrated t (ASIC), or the like. The controller preferably is coupled to a power supply and also an information ge device, such as a wireless internet or Bluetooth adaptor, to allow for the exchange of information between the outside world and the controller (66). The system may be configured to operate at an image h rate, such as a rate between 30 and 60 frames per second. The controller may be configured to e a high— refresh rate digital high resolution display (52), such as a ferro—liquid, bluephase, or bent-core display, to display various zone plate geometries quickly in succession, pertinent to each of the 12 or so depth layers. For example, in an embodiment wherein 60 frames per second overall performance is desired, the zone plate display (52) may be operated at 12 times this, or 720Hz, to be able to provide simulated accommodation to each of the 12 depth layers as shown in Figure 3B. The occluding mask display (54) is configured to display a blacked out image geometrically corresponding to the image displayed before it on the transparent projector layer (56) — blacked out to prevent light from the other side of the occluding mask y from bleeding through or interfering with display of a desired virtual or augmented image in the projector layer (56). Thus in an augmented reality configuration, as shown, light from the real background passes through the non—masked portions of the occlusion mask (54), though the arent (i.e., not broadcasting a portion of an image) ns of the transparent projector layer (56), and into the zone plate layer (52) for accommodation treatment; images projected at the projecting layer (56) receive mask blocking from ound light at the occlusion layer (54) and are projected forward into the zone plate layer (52) for accommodation treatment. The combination ofthese, or the associated perception of the augmented reality to the user, is very close to “true 3—D”.

Figures 12A—12B depict another embodiment wherein an imaging module (58) comprises high-resolution mini tor oriented at an angle approximately perpendicular to the visual axis of the eye; a ide comprising a substrate guided delay exit pupil expander device (70) magnifies and cts the image from the small mini projector and into the zone plate layer (52); the occluding layer (54) provides similar masking functions to protect perception of the projected images from background lighting.

Figures 13A—13B depict another embodiment elements 52 and 70 are combined such that the zone plate and projecting layer are essentially housed within the same integrated module (72) which intakes a small image from the mini tor (68), redirects and magnifies it, and also diffracts it, for passage to the eye; the occluding layer (54) provides similar masking functions to protect perception of the projected images from background ng.

Various exemplary embodiments of the invention are. described herein. Reference is made to these examples in a non— limiting sense. They are ed to illustrate more broadly applicable aspects of the invention. Various changes may be made to the invention bed and lents may be substituted t departing from the true spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation, material, composition of matter, PCT/U82012/000560 process, process act(s) or step(s) to the objective(s), spirit or scope of the present invention. Further, as will be appreciated by those with skill in the art that each of the individual variations described and illustrated herein has discrete components and features which may be readily separated from or combined with the features of any of the other several embodiments without departing from the scope or spirit of the present ions. All such modifications are intended to be within the scope of claims associated with this disclosure.

The invention includes methods that may be performed using the subject s. The methods may comprise the act of providing such a suitable device. Such provision may be performed by the end user. In other words, the "providing" act merely requires the end user obtain, access, approach, position, set—up, te, up or otherwise act to provide the requisite device in the subject method. Methods recited herein may be d out in any order of the recited events which is logically possible, as well as in the recited order of .

Exemplary aspects of the ion, together with details regarding material selection and manufacture have been set forth above. As for other details of the present invention, these may be appreciated in tion with the above—referenced patents and publications as well as generally known or appreciated by those with skill in the art. The same may hold true with respect to method—based aspects of the invention in terms of additional acts as ly or logically employed.

In on, though the invention has been described in reference to several examples optionally incorporating various es, the invention is not to be limited to that which is described or indicated as contemplated with respect to each variation of the invention. Various changes may be made to the 2012/000560 invention described and equivalents (whether recited herein or not included for the sake of some brevity) may be substituted without departing from the true spirit and scope of the invention. In addition, where a range of values is provided, it is understood that every intervening value, between the upper and lower limit of that range and any other stated or intervening value in that stated range, is encompassed within the invention.

Also, it is contemplated that any al feature of the inventive variations described may be set forth and d independently, or in combination with any one or more of the features described herein. Reference to a singular item, includes the possibility that there are plural of the same items present. More specifically, as used herein and in claims associated hereto, the singular forms "a," "an," "said," and "the" include plural referents unless the ically stated otherwise. In other words, use of the articles allow for "at least one'I of the subject item in the description above as well as claims ated with this disclosure. It is r noted that such claims may be drafted to exclude any optional element.

As such, this statement is intended to serve as antecedent basis for use of such exclusive terminology as I'solely," "only" and the like in connection with the recitation of claim elements, or use of a "negative" limitation.

Without the use of such exclusive terminology, the term ising" in claims associated with this sure shall allow for the ion of any additional element--irrespective of whether a given number of elements are enumerated in such claims, or the addition of a feature could be regarded as transforming the nature of an element set forth in such claims.

Except as specifically defined herein, all technical and scientific terms used herein are to be given as broad a commonly tood meaning as possible while maintaining claim validity.

The h of the present invention is not to be limited to the examples provided and/or the subject ication, but rather only by the scope of claim language associated with this sure.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as, an acknowledgamnn: or admission or any fonn of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of our to which this specification relates. 2012/000560

Claims (1)

1. CLAIMS : A dimensional image visualization system, comprising: a. a selectively transparent projection device for projecting an image toward an eye of a viewer from a projection device position in space relative to the eye of the viewer, the projection device being capable of assuming a substantially transparent state when no image is projected; ' b. an occlusion mask device d to the projection device and configured to selectively block light traveling toward the eye from one or more positions opposite of the projection device from the eye of the viewer in an occluding pattern correlated with the image projected by the projection device; and c. a zone plate diffraction patterning device interposed n the eye of the viewer and the projection device and configured to cause light from the projection device to pass through a diffraction pattern having a able geometry as it travels to the eye and enter the eye with a simulated focal distance from the eye based at least in part upon the selectable geometry of the diffraction pattern. The system of claim 1, r comprising a controller operatively d to the projection device, occlusion mask device, and the zone plate diffraction patterning device and configured to coordinate projection of the image and associated occluding pattern, as well as interposition of the diffraction pattern at the selectable geometry. The system of claim 2, wherein the controller comprises a microprocessor. The system of claim 1, wherein the projection device comprises a substantially planar transparent digital display substantially occupying a display plane. PCT/U