WO2022115534A1 - Module optique transparent utilisant des plaques de pixels et petites lentilles associées - Google Patents

Module optique transparent utilisant des plaques de pixels et petites lentilles associées Download PDF

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Publication number
WO2022115534A1
WO2022115534A1 PCT/US2021/060730 US2021060730W WO2022115534A1 WO 2022115534 A1 WO2022115534 A1 WO 2022115534A1 US 2021060730 W US2021060730 W US 2021060730W WO 2022115534 A1 WO2022115534 A1 WO 2022115534A1
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WIPO (PCT)
Prior art keywords
lenslet
patch
user
pixel
patch unit
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Application number
PCT/US2021/060730
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English (en)
Inventor
Rick MORRISON
Igor Landau
Svetlana Samoilova
Original Assignee
NewSight Reality, 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 US17/103,703 external-priority patent/US11454815B2/en
Application filed by NewSight Reality, Inc. filed Critical NewSight Reality, Inc.
Publication of WO2022115534A1 publication Critical patent/WO2022115534A1/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
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/24—Myopia progression prevention
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/022—Ophthalmic lenses having special refractive features achieved by special materials or material structures

Definitions

  • the present invention is directed to operation of a near eye augmented reality (“AR”) or mixed reality (“MR”) system that integrates the virtual image generated by the near eye display to the real environment taking account of the visual processes of the retina, the visual cortex and the oculomotor system.
  • AR near eye augmented reality
  • MR mixed reality
  • the current invention is directed to transparent optical module (“TOM”) architecture, which is built and/or configured in a manner to provide system scalability.
  • a transparent optical module (“TOM”) system or device comprises an optical architecture hierarchy based on a patch unit.
  • the module may be transparent, transmissive, partially transparent, partially transmissive, opaque, partially opaque, or combinations thereof.
  • the patch unit comprises one or more regions of display pixels, or a pattem(s) or pixels, and an associated lenslet, for example on a microlens array (“MLA”).
  • MLA microlens array
  • the lenslet is capable of transmitting display-emitted light to an eye of the wearer of the TOM, which then focuses the light to form a retinal image, which is seen or perceived by the wearer.
  • the patch units can be combined further into patch groups, wherein members of a group serve a similar role in retinal image production as a patch unit and/or lenslet. This hierarchy allows the system to be scaled to larger and more complex systems.
  • TOM architecture is built in a manner that provides system scalability.
  • a patch unit optical
  • a patch group layout
  • a lenslet focuses a display pixel or patch to a retinal spot or portion.
  • xLED may be used to refer to, cover, or describe, but is not limited to: OLED (organic Light Emitting Diode), TOLED (transparent OLED), microLED (also pLED and mLED), iLED (refers to microLED, inorganic LED), PMOLED and AMOLED (Passive Matrix and Active Matrix OLEDs), QD-LED (quantum dot LED), or combinations thereof.
  • OLED organic Light Emitting Diode
  • TOLED transparent OLED
  • microLED also pLED and mLED
  • iLED refer to microLED, inorganic LED
  • PMOLED and AMOLED Passive Matrix and Active Matrix OLEDs
  • QD-LED quantum dot LED
  • a lenslet and its pixel patch will generally be referred to herein as a patch unit.
  • multiple patch units are used to build a larger mosaic image on the retina. Due to magnification, a sparse set of patches and lenslets (i.e., patch unit(s)) can produce a full image as perceived by a user; accordingly, patch units are capable of being sparsely distributed due to magnification.
  • the array of lenslets is again generally referred to as a MicroLenslet Array or Microlens array (“MLA”).
  • MLA MicroLenslet Array
  • the display pixel patches form a sparse microdisplay. The intermediate area between primary patch units allows inclusion of additional patch units to provide extra functionality.
  • patch units that produce retinal images that overlay each other (or in cases are separate or projected side-by-side on the retina) are sometimes defined herein as a patch group.
  • patch units are configured so that lenslets do not overlap. In cases, it may be necessary to shield light to control stray light transmitted in between lenslets or potentially couple to neighboring lenslets. Since patch units in a patch group can act individually, in aspects, a patch unit or units can be illuminated independently to support different functions.
  • a grid of patch units can be rectangular or hexagonally packed or any other shape. Rectangular packing, in cases, simplifies some aspects of determining how to decompose the digital image data into sub-images.
  • the notion of the patch unit and patch group or group of pixel patches applies to both static and dynamic MLAs.
  • a dynamic (or active) MLA may refer to, cover, or describe one or more of: switchable MLA; tunable MLA; electrically switching lenslets; nematic phase lenslets; smectic phase lenslets; liquid crystals; cholesteric liquid crystals; polymer encapsulated liquid crystals; nano-scale polymer encapsulated liquid crystals; blue phase liquid crystals; electrowetting lenslets; electrostatic lenslets; ferrofuidic lenslets; di electrophoretic lenslets; pressure actuated liquid lenslets; micro-mechanical variable focus lenslets; elastomeric membrane lenslets; mechanically stretchable lenslets; chemically ion activated lenslets; and/or acousto-optical lenslets.
  • the invention is a system for producing an image including a see- through near eye optical module comprising a see-through near eye display and a micro-lenslet array, wherein the see-through near eye display comprises a plurality of light-emitting pixels or pixel patterns and the micro-lenslet array comprises one or more lenslets; wherein the plurality of light-emitting pixels are configured as a pixel patch; wherein a pixel patch in optical communication with the one or more lenslets is configured as a patch unit; and wherein the see- through near eye display and the micro-lenslet array are capable of permitting light rays from a physical object in an external environment to pass through the see-through near eye optical module to the user’s retina.
  • the light from the display and the real world external environment together are capable of generating augmented reality, mixed reality, enhanced reality, virtual reality, etc.
  • the TOM and/or optical module is hermetically sealed.
  • optical terms and parameters that describe the operation and performance of the lenslet and the patch unit as described herein. These terms include, but are not limited to, magnification, field of view, resolution, and visual acuity, by way of example. Some of these parameters may influence the optical design and manufacture of the lenslet as described herein, or as would be understood by one of skill in the art.
  • FOV field of view
  • This FOV can be described as an angle or as the pixel area or pixel patch on the patch unit.
  • FOV may refer to an angle or area of a patch group. It is typically, but not always, desirable to produce a large patch unit FOV, or the largest patch unit FOV feasible.
  • factors such as the lenslet performance and stray light generation have an influence on the design FOV.
  • an aspherical lens surface form may be necessary to improve imaging quality for pixels near an edge or extreme edge of the patch unit FOV.
  • the lenslet pitch can be designed to vary from the center to the edge of the lenslet array to, in cases, improve imaging properties (e.g., by minimizing Coma and other aberrations) from the periphery of the pixel patch.
  • the patch unit FOV according to preferred embodiments described herein is designed to produce an image that can fill the high- resolution foveal region of a user’s retina.
  • the FOV in aspects can range from a 10-degree full angular field up to larger values. Therefore, multiple patch groups can be used to produce a complete wide-angle view.
  • magnification may describe the relationship between the angular extent at the retina versus that of the display pixel patch or patch unit.
  • an image magnification is preferably about 7X to 10X, whereas a single lens, single display VR system would have a magnification closer to 1.
  • the visual acuity of the eye refers to the clarity of vision and ability to recognize detail as described herein or as would be understood by one of skill in the art.
  • the typical eye is able to detect about 1 arc minute angular resolution and is sometimes presented in the form of a measurement, such as 20/20 vision.
  • the visual acuity depends on the retinal resolving elements (rods and cones), aberrations from the eye’s lens, and diffractive effects due to aperture size.
  • the objective of the TOM as described herein is to present information that is a suitable or preferable match to the eye’s visual acuity. For example, text should be sufficiently sharp and sufficiently large to be readable, while images should provide preferably well-resolved features.
  • the application of the TOM and system described herein will in aspects determine the visual acuity level that the display, system, or TOM be able to achieve.
  • stray light is light that does not follow the correct or preferred path through the TOM and may produce a glare or background haze that reduces overall contrast of the desired images.
  • the desired image light includes the real world view formed from light from the external world that passes through the transparent areas of the display substrate and the regions between lenslets on the MLA, especially in the case of a static MLA.
  • the stray light for a dynamic MLA differs from a static MLA.
  • a dynamic MLA is expected to be “on” for only a fraction of time as a wearer uses the TOM described herein.
  • the MLA operates as a set of lenslets while the display is synchronized to emit light.
  • the switched off state in aspects, the MLA behaves as though it is a transparent window, and the display does not emit light.
  • the stray light situation will be the same or similar as described for a static MLA. However, when the dynamic MLA is switched off, typically less stray light will be present compared to a static MLA.
  • the desired virtual image is formed from light emitted by a display pixel or pixel patch, for example, and then directed through its patch unit lenslet to the eye forming the retinal image.
  • Real world light that passes through a lenslet and is redirected is one form of stray light.
  • Another form of stray light is display light that passes through the region between lenslets and is therefore not focused.
  • light from a patch unit pixel or pixel patch that passes through an adjacent or distant patch unit lenslet and, in cases, misses its own patch unit lenslet
  • a pixel’s or pixel patch’s emitted light may be directed through a refractive, reflective, and/or diffractive TOM lens or lenslet.
  • the lenslet may be fabricated as a curved surface on an optically transparent substrate. The surface may have a spherical, aspherical, or other arbitrary mathematical description. The lenslet could also provide focusing capability by dynamically adjusting its power generating properties such as index of refraction and/or curvature structures.
  • the lenslet may be composed of multiple layers of material or a single material.
  • a diffractive or holographic element may direct the light using wave interference methods.
  • the lenslet may comprise a single surface on a supporting substrate, or be composed of multiple surfaces on dual sides of the substrate or multiple substrates.
  • the apertures of a multiple component lenslet may be oriented in line with each other, or not.
  • the lenslet or lenslet set may be decomposed into multiple areas with intervening transparent or shielding areas.
  • the lenslet apertures may be circular, square, hexagonal, or any arbitrary shape for optimum image quality while minimizing stray light.
  • LCs Liquid Crystals
  • LC technologies may be used separately or in combinations, such as conventional nematic or smectic phase and cholesteric liquid crystals.
  • PDLCs polymer encapsulated LCs
  • nPDLCs nano-scale variety
  • LCs In addition to LCs, other technologies can be employed for fabrication of active or dynamic MLAs; these include but are not limited to, electrowetting, electrostatic, ferrofuidic and di electrophoretic and pressure actuated liquid lenses.
  • Various micro-mechanical variable focus lenses may also be used such as elastomeric membranes, which, in aspects, are mechanically stretched.
  • Chemically ion activated lenses and lenses that utilize the various acousto-optical effects can also be employed in dynamic MLAs.
  • All the above active/dynamic MLA technologies can be used separately, and/or in combination to enhance, improve, or optimize image quality and also to minimize undesired stray light.
  • FIG. 1 is a schematic diagram showing a possible embodiment of the current invention showing a configuration of display, to lenslet(s), to pupil, to retina.
  • FIG. 2 is a schematic diagram showing a possible embodiment of the current invention showing a configuration of display, to lenslet(s), to pupil, to retina.
  • FIG. 3 is a schematic diagram showing a possible embodiment of the current invention showing a configuration of display, to lenslet(s), to pupil, to retina.
  • FIG. 4 is a schematic diagram showing a possible embodiment of the current invention showing a configuration of display, to lenslet(s), to pupil, to retina.
  • FIG. 5 is a schematic diagram showing a possible embodiment of the current invention showing a configuration of display, to lenslet(s), to pupil, to retina.
  • FIG. 6 is a schematic diagram showing a possible embodiment of the current invention showing a configuration of display, to lenslet(s), to pupil, to retina.
  • FIG. 7 is a schematic diagram showing patch units according to current invention.
  • FIG. 8 is a schematic diagram showing possible embodiments of the current invention showing configurations of display, to lenslet(s), to pupil, to retina.
  • FIG. 9 is a schematic diagram showing a possible embodiment of the current invention showing a configuration of display, to lenslet(s), to pupil, to retina.
  • FIG. 10 is a schematic diagram showing a possible embodiment of the current invention showing a configuration of display, to lenslet(s), to pupil, to retina.
  • FIG. 11 is a schematic diagram showing a possible embodiment of the current invention showing a configuration of display, to lenslet(s), to pupil, to retina.
  • FIG. 12 is an illustration showing a possible embodiment according to current invention wherein a wearer of the device/system sees virtual images in multiple focal planes.
  • FIG. 13 is a schematic diagram showing a possible embodiment of the current invention showing a patch group with a lenslet having four differing focal lengths producing differing focal planes.
  • FIG. 14 is a schematic diagram showing a possible embodiment of the current invention showing a configuration of display, to lenslet(s), to eye.
  • FIG. 15 is a schematic diagram showing a possible embodiment of the current invention showing lenslets of various sizes composing patch units.
  • FIG. 16 is a schematic diagram showing a possible embodiment of the current invention illustrating possibility of color production via monochrome xLED areas.
  • FIG. 17 is a schematic diagram showing a possible dithering embodiment of the current invention.
  • FIG. 18 is a schematic diagram showing a possible architectural layout embodiment of the current invention.
  • FIG. 19 is a schematic diagram showing a possible architectural layout embodiment of the current invention.
  • FIG. 20 is a schematic diagram showing a possible brightness enhancing embodiment of the current invention.
  • FIG. 21 is a schematic diagram showing a possible embodiment of the current invention, including showing components for forming a virtual image(s) as described herein and interaction with the retina of a virtual image(s) and a real world image(s), thereby creating, for example, augmented reality.
  • Figure 22 is a flowchart showing a possible embodiment of the current invention. DETAILED DESCRIPTION OF VARIOUS EMBODIMENTS OF THE INVENTION
  • Figure 1 shows one possible embodimentr of an optical design that relays device pixel light to a retinal spot.
  • the schematic shows how light from a single pixel or element 1001 located on or near the display device 1002 1002 is collected by the lenslet 1003, transmitted to a wearer’s eye pupil 1004, and then imaged by the wearer’s eye to a spot or portion on the wearer’s retina 1005.
  • the lenslet aperture is preferably smaller than an eye pupil aperture, and a lenslet aperture diameter determines a resolvable retinal spot size.
  • the lenslet diameter will be designed or made to be less than the eye pupil diameter.
  • the lenslet diameter is a factor in determining the size of the resolvable retinal spot that can be achieved.
  • Lenslet diameter may also influence the amount of light collected from the display element (e.g ., a pixel, pixel patch, or patch group) and thus the perceived brightness of, for example, a virtual image, as well as power efficiency of the unit, device, or system.
  • Figure 2 and Figure 3 show the lenslet imaging a patch field (either pixels or a pattern of pixels) on the display or TOM to form a retinal image.
  • the optics in these examples are operating at, in aspects, infinite conjugate so that the image(s) appear to be located at infinity.
  • Figure 2 shows the on-axis and chief rays/beams.
  • lenslet 2003 optical power, focal length, or effective focal length sets the system magnification. So, for example, a pixel patch area 2006 appears magnified to the retina and the result is a sparse display.
  • the TOM is capable of providing a magnification of around or about 7-10X.
  • Figure 3 shows both chief and marginal rays/beams, wherein the lenslet defines the system aperture stop.
  • the lenslet diameter will have an influence on the field size of the pixel patch that can be imaged. Therefore, the lenslet diameter is one of the trade variables in optimizing the optical design; more specifically, the optic design is determined by several parameters that may be varied depending on the importance of brightness, retinal resolution, TOM thickness, real world transparency, and so forth. These parameters include lenslet surface shape, lenslet diameter and focal length, and lenslet spacing. These are typically trades that are prioritized during the design optimization process.
  • Figure 3 also shows that the light spreads with increasing distance from the lenslet.
  • Figure 3 includes a ray/beam trace showing greater detail of light emitted by pixel patch and transmitted to an eye.
  • a separation distance exists between the eye and the TOM, referred to in some cases as eye relief, in a practical system. Therefore, vignetting and eyebox size will become considerations.
  • FIG. 4 shows multiple patch units (single patch unit 4007) in a patch group 4008 illuminating an area larger than the eye pupil.
  • the pixels when pixel light is focused by multiple lenslets and directed along a common angular trajectory, the pixels will be focused to the same retinal spot or portion. In this way, several patch images can overlay each other at the retina. This occurs in the TOM system because the lenslet aperture size is typically smaller than the eye pupil size, although in aspects it can be the same size as the eye pupil or larger. Patch units that produce this sub-image overlay are said to be part of the same patch group.
  • the overlaid images enhance the perceived brightness to the wearer of, for example, a virtual image.
  • a human or animal eye pupil changes size depending on environmental light.
  • the human pupil size may be 2 to 4 mm in diameter in bright situations and 4 to 8 mm in darkness.
  • the current invention such as the TOM, optical module, display, display elements, MLA, and/or MLA elements, are designed for bright or dark illumination circumstances.
  • the TOM, optical module, display, display elements, MLA, or MLA elements may be curved or have an arbitrary surface to match that of an optic, such as for eyeglasses, or for an eyeglass lens, or for a contact lens.
  • a ratio of lenslet optical power to eye lens optical power determines the magnification of the display patch on the retina. As the magnification increases, ever smaller pixel sizes will be needed to produce a high-resolution image that avoids screen door effect. Regarding the “screen door effect,” the pixel set typically includes non-emitting areas between pixels that provide electrical connectivity.
  • patch unit is sometimes used herein to define a pixel patch and the associated lenslet that are able to produce a retinal image.
  • the display pixel patch 5006 and the lenslet 5003 exist on separate physical components; for example, an xLED display 5002 and an MLA 5009 as shown in Figure 5, although it is possible to include the pixel patch and the lenslet on the same component.
  • a TOM optical system will be composed of multiple patch units 5007 capable of operating independently of one another.
  • Figure 5 illustrates how light from multiple lenslets/patch units are able to simultaneously pass through the eye pupil and share in producing, for example, a common image or parts of a common image on the retina.
  • the optical axis of the patch unit is normal to the planar display and the lenslets have been set to collimate pixel light. Multiplicity is achieved because the lenslets 5003 have a diameter smaller than that of the eye pupil. The number of lenslets that are able to fill the eye pupil will depend on the relative size of eye pupil and lenslet, and the trajectory that the patch unit directs light. Accordingly, Figure 5 shows multiple patch 5007 units forming a larger retinal image mosaic 5010, and it shows that it is also feasible to direct light from multiple patch units to form a mosaic at the retina producing a larger image.
  • each pixel patch or patch unit could contain a different subimage defined, for example, by external or internal processors. Further, in embodiments, the xLED display and the MLA would conform to a curved surface.
  • Figure 6 shows patch units 6007 arranged on curved surfaces for both the display and the MLA. This configuration may be capable of leading to improved optical on-axis usage of the lenslets and the imaging performance. In this situation, the TOM will also conform to the shape of eyeglass optics to which it can be attached, connected, embedded, or associated.
  • the optical architecture comprises a lenslet imaging a display pixel or patch to a spot or portion on the retina.
  • the lenslet is able to image an extended field of view on the display composed of a patch of pixels that forms a sub-image on the retina.
  • the display patch unit can be replicated in an array fashion using a sparse, mostly sparse, or partially sparse micro-display device and a micro-lenslet array to produce a larger composite retinal image.
  • the display pattern projected by a primary patch unit will differ from the others. Due to the short focal length of the lenslets in this example of the system, the display magnification is relatively large, ranging from about 5x to lOx, by way of example. Therefore the lateral distance between critical primary patch-lenslet sets (e.g. , patch units) will be larger than the lenslet diameter.
  • Figure 7 shows the top view of lenslets of a patch unit layout, wherein primary patch units 7007 are, in this example, the minimal necessary to produce the composite retinal image.
  • the hollow circles represent additional lenslets 7011 that can be used for patch groups.
  • This figure, as well as others shows how to create multiple range virtual image planes, virtual image focal planes, virtual distances, virtual depths, or combination thereof.
  • Overlaid retinal sub-images are produced by the patch units, which provides advantages compared to currently existing display concepts. Due to the limited field of view of the lenslets, in examples, several patch units are needed to produce a larger mosaic image. However, the minimal set of patch units, in this example, is sparse. This is shown by the solid blue lenslet circles 7007 in Figure 7.
  • the intermediate area can be filled by extra patch units that provide additional functionality.
  • additional patch units are shown as hollow circles 7011 in Figure 7.
  • the additional units will create retinal sub-images that overlay each other, sometimes referred to as a patch group. If the optical power or effective focal length of additional lenslets are designed to vary slightly from each other, then respective sub-images appear to focus at different virtual image focal planes, virtual distances, or virtual depths, than other units.
  • the actual patch unit size and patch group layout will depend on specified optical parameters, such as lenslet size, pixels per patch, eyebox size, use cases of the product with integrated TOM, etc.
  • solid color circles 7007 represent the minimal set of primary patch units to create the composite retinal image and hollow circles 7011 are additional patch units inserted between primaries.
  • the additional patch units produce multiple virtual focal image planes, distances, depths, or combinations thereof. Rather than leaving the space between patches empty, it is possible according to the current invention to insert more patch units in order to increase system functionality.
  • patch groups are able to increase the image brightness, increase the eye box size, vary in size as needed for resolution, dither the sub-images to smooth the image, and provide multiple virtual image plane focal distances. Assigning patch units into the space between primary patch units will reduce the sparseness of both the display and MLA and will thereby lead to reduced transparency for real world view light (see, e.g., Figure 21).
  • each patch group produces redundant images, therefore individual patch units comprising the group can be dispersed in locations over the display or have slightly varying features to provide unique functionality for the TOM. These options include:
  • the eyebox size is a system consideration since mounting an AR, MR, or virtual reality (“VR”) unit should account for the variation of inter-pupil distance and eye position variation of the user population. Also, the eye pupil moves as the gaze shifts to an alternate angle.
  • the eyebox is the volume that the eye can be located within and still view the full display. Eyeball rotation can move the pupil a few millimeters from its straightforward gaze position.
  • the eyebox for an individual patch unit is, in aspects, about the size of the lenslet diameter, a minor shift in the gaze angle would normally lead to partial or complete vignetting of the patch unit light.
  • multiple patch units can be designed according to the current invention to produce similar overlapping retinal images no matter how they are arranged across the display device.
  • the eyebox size can be increased by including multiple patch units in the architecture.
  • Figure 8 shows light rays collimated into beams by a lenslet 8003 from the center and extreme pixels on a pixel patch.
  • the arrows at the right 8012 of Figure 8 show how the extent of the rays/beams diverge with distance from the lenslet. Eventually the divergence can become so large that the eye pupil may not capture all rays/beams leading to vignetting of the pixel patch.
  • Figure 8 effectively illustrates propagation of light rays emitted by patch pixels and focused into beams by a lenslet. This configuration focuses the light to appear to the eye as though the pixel patch is located at an infinite distance (infinite conjugate).
  • the rays from each pixel in this case form constant diameter beams traveling away from the lenslet. As the beams propagate, they diverge from the center on-axis beam.
  • the vertical arrows at the extreme right 8012 in Figure 8 show how beams separate at a distance from the lenslet. If the lenslet were positioned just outside the eye pupil, and if the lenslet diameter were smaller than that of the pupil, then all the light would be captured and imaged by the eye. Such would be the case if the patch unit could be mounted within or near the location of a contact lens. However, in some cases, an eye relief distance will be needed so that the TOM module is clear of the region in the vicinity of the eye similar to the eye relief provided by eyeglasses.
  • the TOM according to the present invention is designed to, in embodiments, be attached to, connected to, embedded in, or associated with an eyeglass optic and will thus be, in cases, about 15 to 25 mm from the front of the eye. Therefore the beams may diverge sufficiently that the pupil obscures a portion of the light. When this happens, the patch image appears vignetted, or cut off along an edge.
  • Figure 9 shows a multitude of patch units 9007 used to illuminate a large region at the eye’s distance, which is capable of creating a larger eyebox region. Only the central pixel rays and beams are shown here.
  • Figure 10 illustrates that when the eye’s gaze shifts upward in the drawing (as compared to Figure 9), the eye pupil is still able to view patch units that create, in cases, identical images. The patch image shifts away from the center of the retina’s foveal region since it is no longer expected to be the straight-ahead view of the gaze (as in Figure 9).
  • the patch units do not have to be packed densely across the eyebox; however, there should be an adequate number being viewed simultaneously since the changing gaze angle will lead to patch unit vignetting and a changing number of overlapping images as the gaze shifts. Accordingly, as illustrated in Figures 9 and 10, shifting the eye gaze angle allows a common image to be viewed over a larger eyebox with similar patch units; therefore, the retinal image can differ depending on where the eye gazes, and, for example, if the eye is looking up or down, it can view an image that differs from a view looking in a different direction, and this concept can be extended to more views as the eye changes gaze direction. This change could lead to an image brightness variation with gaze if the number of patch units viewed is, for example, less than about 10.
  • the gaze dependent views will change and blend in the transition region between patch units.
  • An application might use this gaze dependent technique to provide an alert in the straight ahead view that directs the user to glance to the periphery to obtain display data that might otherwise obscure the critical direct ahead view.
  • varying the pattern across a patch group can lead to gaze dependent viewing, and here, as shown in Figure 11, the upper and lower gaze images (or, e.g., left and right and/or diagonal) will differ from that of the center gaze. Since the pixel patch and/or patch unit image varies according to location, the retinal image differs depending on where the eye gazes.
  • the perceived image brightness increases. This is a consideration when the xLED display provides limited illumination power and the TOM system is used in a bright outdoor environment.
  • the patch units can be concentrated in close proximity to each other on the display to promote the increased brightness.
  • Figure 20 shows a set of patch units that similarly direct light through the pupil to produce overlaid images that increase the apparent brightness of the retinal image.
  • the figure shows multiple lenslets 2003 in an MLA directing light equivalently over an area larger than that of the eye pupil. This configuration increases the size of the eyebox, too.
  • the patch units of a patch group may be concentrated together.
  • the patch units can be distributed more sparsely.
  • the system uses a fixed focal length for all MLA lenslets and a fixed display to MLA separation to produce an image the eye interprets as being located at a common focal distance from the user.
  • This common virtual focal plane might appear to be located at infinity or at a closer location such as 6 feet distance depending on the lens optical design.
  • software applications will generate the display image for each virtual image focal plane, distance, or depth, and the mechanism is described in greater detail in the explanation of Figure 13 and Figure 14 herein.
  • the multi-virtual image focal plane range may have a greater impact for binocular systems where eye convergence and accommodation, if not matched, can lead to viewer fatigue.
  • the apparent virtual image focal plane could be adjusted if the display-to-lenslet separation could be mechanically varied; however, in cases, this would introduce undesirable complexity into the system and an avenue for potential system failures.
  • the TOM system according to the present invention is able to address this need for multiple virtual image focal planes by varying virtual display focal power or effective focal length among the lenslets, and in cases the lenslets within a patch group.
  • FIG. 13 shows a patch group composed of a 2x2 array of patch unit lenslets.
  • the numbers on the Figure lenslets identify the focal plane distances of 1, 2, 3, and 4+ meters.
  • the most distant focal plane will be designed to the eye’s hyperfocal distance, thereby accommodating an infinite distance plane, for example.
  • the number of focal planes can be determined by application specifications and limited by the number of patch units that fill the space available for a patch group.
  • the value of the optical power or effective focal length between the focal lengths may vary by less than 1%, so the lenslets are virtually identical, in aspects.
  • a custom MLA in cases, may need to be designed and fabricated with the lens form varying across the component, which would be understood by one of ordinary skill in the art.
  • the illustration shows an example of a patch group lenslet set inside an MLA composed of an array of 2x2 lenslets 1304
  • Each lenslet has a slightly different optical power or effective focal length.
  • the lenslet labels indicate optical designs that produce a 1 meter, 2 meter, 3 meter, and infinite distance or depth virtual image focal plane.
  • the number of lenslets in the patch group lenslet set can be larger than 2x2.
  • lenslets can also serve functions other than producing virtual image planes, since this many display planes may be larger than needed.
  • FIG 14 shows light ray/beam traces of two patch unit 1407 configurations.
  • the lenslet and pixel patch (patch unit 1407) are set to operate at infinite conjugate.
  • the virtual image plane appears to be at infinity.
  • Infinite conjugate configuration Blue light rays from display spot are focused to a collimated beam.
  • the lenslet optical power or effective focal length is higher, greater, or longer, so the rays/beams appear to emit from a closer virtual image focal plane.
  • (Finite conjugate configuration - Optical or focal power is less than that of lenslet in infinite conjugate configuration. Effective focal length is longer than infinite conjugate case.
  • (f d.) Red rays show apparent eye gaze. Virtual image plane appears to be at a distance closer than infinity when viewed by eye.
  • the two patch units 1407 may be similar except that the bottom configuration has a weaker effective focal length lenslet, so that the rays/beams seem to diverge from a virtual image point making it appear that the imaged pixel location is at a focal plane closer than infinity.
  • lenslet optical powers or effective focal lengths across the MLA a variety of virtual image focal planes, distances, depths, or combinations thereof, can be produced.
  • the presentation of a particular virtual image focal plane, distance, or depth to the user can be managed by system electronics. For example, when a single focal plane is desired, then only one specific pixel patch of a patch group will be powered to illuminate. If a virtual image(s) is composed of multiple focal planes, then multiple patches will be illuminated and the electronic processing engine will determine the appropriate pixel sets to light on each patch unit so that the retinal image does not contain confusing overlap.
  • the processor will also account for the variation in magnification between patch units (e.g ., due to varying optical powers or effective focal lengths of relevant lenslets). It may also, in cases, be necessary to include eye tracking hardware and software to determine the user gaze.
  • one or more processors and/or accompanying software or applications will determine the necessary optical power or effective focal length of one or more lenslets in order to implement the effect described above wherein intentionally changing or choosing the optical power or effective focal length of one or more lenslets creates a perception that virtual images are at varying focal distances, planes, or depths as perceived by a person wearing the TOM.
  • a processor may determine that a virtual image should appear at a certain distance from a user and activate patch units and/or patch groups having lenslet optical power or effective focal length suitable to make the virtual image appear at the desired distance from the user (or, in aspects, instruct relevant lenslet(s) to change optical power or effective focal length to make the image appear at the desired distance from a user).
  • the optical power or effective focal length to achieve the desired perception will be set by the one or more processors and the settings or ranges can be predetermined or determined by the one or more processors dynamically depending on circumstances such as the virtual image size or shape, the real world input, movement, visual cues, brightness, the desired distance, other real world or virtual objects, and other factors.
  • FIG 22 shows a possible embodiment of a method one or more processors might take to allow the TOM to allow for creation of the perception by the user that virtual images are at different distances from a user or take up different space in a real and/or virtual environment.
  • the processor may identify the virtual image or what distance a virtual image should appear from a user whether in real or virtual space and depending on where the user and where the virtual image/object are in space 2201.
  • the processor can activate a particular patch unit or patch group having a lenslet(s) with an optical power or effective focal length preferable for creating an image at the desired perceived distance (or, in aspects, a lenslet can be modified to create the perception of distance) 2202.
  • the processor can determine the optical power or effective focal length that the lenslet should be (or change to be) in order to make the virtual image/object appear at the desired distance 2202.
  • the processor will activate a chosen patch unit(s) and/or patch group(s) having a lenslet(s) with an optical power or effective focal length to achieve the perception of the desired distance of the virtual image/object 2203.
  • the processor will instruct the relevant lenslet or lenslets to change optical power or effective focal length as decided by the processor that is appropriate to achieve the perception of the desired distance of the virtual image/object 2203
  • the processor is capable of dynamically communicating internally and with elements on the TOM so that different virtual images that the processor determines should be at different distances from the user can appear to be located in space at different or multiple virtual image focal planes, distances, or depths in space or relative to one another 2204
  • the processor is capable of recognizing these changes and dynamically carrying out the method so that chosen patch units and/or patch groups having lenslets with preferred optical power or effective focal lengths will be activated (or, in aspects, so that lenslet(s)’ optical powers or effective focal lengths are capable of changing) as the user moves in space or the virtual images move.
  • the processor will account for changing desired distances and activate different patch units or patch groups (or instruct lenslets to change) and account accordingly so that from the perspective of the user he/she is moving around in space or objects are moving around in a virtual or real world environment 2205 Moreover, because the lenslets, groups of lenslets, patch units, and patch groups are capable of operating independently, one virtual image can appear at one distance and another virtual image can appear at a different distance.
  • the perceived distance of the virtual images from the user can change, and the processor can account for the perception of these virtual images in space as they or the user move by changing which patch units or patch groups are activated (or by changing lenslet(s) optical power or effective focal length) in real-time or near-real-time, in embodiments, to create perception of movement and varying changes in distance and perspective, including the appearance of different virtual images at different distances from the user.
  • the system is capable of creating the perception of a three- dimensional object in space by simultaneously activating multiple patch units having different lenslet optical powers or effective focal lengths to create a 3D virtual image.
  • patch units having an optical power or effective focal length to make parts of the object appear closer to the TOM will activate simultaneously as different patch units having different optical powers or effective focal lengths to make parts of the same object appear farther from the TOM.
  • several virtual image focal planes, depths, or distances can be viewed or perceived simultaneously to produce the appearance of a 3D object to the user. Therefore, in embodiments having static lenslets, multiple patch units will be on or activated to create the virtual 3D view.
  • one or more processors can power the determination of where objects or parts of objects should appear in space, which lenslet optical power(s) or effective focal length(s) is suitable or preferable to create the 3D perception of different distances/locations, which patch units should be activated to create the perception of 3D depending in cases on the lenslet optical power or effective focal length of those patch units, or in cases of dynamic/active MLAs changing optical powers or effective focal lengths of particular lenslets.
  • the processor can make the determinations and activate or change the properties in real-time or near-real-time so that the viewer perceives that the viewer is moving in 3D space or that objects are moving in 3D space.
  • the processor or system reaches step 2205 of Figure 22, the process repeats itself by starting back at step 2201.
  • the processor is capable of skipping steps, repeating steps, going back to prior steps, going ahead to later steps, or otherwise acting dynamically.
  • the lenslet diameter will influence retinal image resolution and the size of the pixel field that can be reasonably imaged.
  • the system will preferably have high resolution in the eye’s foveal region, which leads to large aperture lenslets to support this.
  • peripheral images can be lower resolution and thus use smaller lenslets that may need to be used off-axis. Therefore, the MLA can be composed of multiple aperture size lenslets. In this manner, patch units supporting the concept of a patch group will be distributed across a relatively large region of the MLA.
  • lenslets that support a direct gaze angle would have the largest apertures and would generally be located near the center gaze angle of the MLA.
  • Peripheral gaze lenslets could have less, such as one half to one quarter the aperture diameter of the lenslets supporting direct gaze angle, and they could be interspersed among other lenslets as shown in Figure 15.
  • MLA fabrication could accommodate various lens forms and sizes across the array.
  • variation of aperture size may influence image resolution and FOV.
  • direct gaze patch units should have high resolution, large aperture lenslets.
  • peripheral gaze patch units can have lower resolution, smaller aperture lenslets.
  • small aperture lenslets large F#’s
  • small aperture lenslets will have a larger display field, but the size of the diffraction limited spot will be greater.
  • Small aperture lenses produce less spot aberration typically.
  • Larger diameter lenslets small F#’s
  • the larger lenslets also couple more light to the retina and will produce brighter sub images.
  • Current xLED displays typically have composite pixels composed of red, green, blue, and possibly white subpixels. When the display is viewed directly by the eye or through a low magnification objective lens, the subpixels blend together without noticeable visual effect.
  • a TOM presents a high magnification image of the pixel patch, so when the sub-pixel size is sufficiently large (>5 microns) the foveal region of the eye may resolve each sub-pixel and the black space between them. This may lead in some cases to a screen door effect and the colors may not desirably blend.
  • a suitable number of patch units should be used that are simultaneously viewed so that the color does not shift during eye gaze movement.
  • Figure 16 illustrates color production via monochrome xLED areas 1616 when monochrome patches are simpler or less expensive to manufacture and will still support the TOM device and system disclosed herein.
  • the overall resolution may be less. Collecting monochrome subpixels into a single patch 1616 and then overlaying three or more patches can produce a color image with higher resolution in this case.
  • This technique may be used if, for example, producing sets of color pixels is more difficult or expensive than producing monochrome sets.
  • the pixels could also be white, and the lenslet could carry a color filter. This, however, in cases, may be a less efficient use of the light.
  • the patch units of a patch group can be varied so that there is a subpixel size offset between the various overlapping retinal images.
  • This technique can be used to smooth a screen door effect (or in cases color banding) making the resulting image, in aspects, more pleasant to view for the user.
  • the technique also allows the perceived image to appear to have a smoother, higher resolution appearance.
  • the dithering technique is produced using sets of patch units that are concentrated in location so that they simultaneously or nearly simultaneously image onto the retina.
  • pixel layout on the microdisplay may be fixed, therefore the layout of the MLA may be chosen for customization.
  • the pixel layout and/or MLA may allow for custom configurations.
  • the center-to-center pitch of the lenslet may be set so that it is not equal to an integral number of pixels, and, in aspects, the offset from the integer multiple may be set to a fraction of a pixel.
  • the lenslet center-to-center pitch between a lenslet and its three neighbors in a 2x2 dithering formation could be about 105 microns along each dimension.
  • a 103.3 micron offset might be selected, for example.
  • Figure 17 shows simulated examples of patch group dithering to reduce retinal image screen door effect.
  • a sparsely populated display pattern is shown 1710.
  • a 2x2 dithering pattern is shown 1720.
  • a 3x3 dithering pattern is shown 1730.
  • Figure 17 shows a sequence of simulated images produced using a Zemax optical design and modeling computer application.
  • the image on the top is a single patch unit output.
  • the display pixels are distinctly separated resulting in spacing between imaged spots similar to an exaggerated screen door effect.
  • the middle image shows the image overlay where a half pixel offset is introduced in a 2x2 set of patch units.
  • dithering herein means producing overlaid sub-images that are each translated by a fraction of a pixel pitch with regard to each other. Dithering may be useful if microdisplay pixels are significantly larger than the eye can resolve, such as resolving the spacing between pixels. Dithering can provide retinal image smoothing. Dithering can also be used to produce interlaced retinal images that create higher resolution images. Assuming that the microdisplay pixel layout is regularly spaced and permanent, the dithering effect may be achieved by shifting the lenslet location in a patch group by a fraction of a pixel relative to a reference lenslet. The shifted lenslets should preferably occur in both horizontal and vertical dimensions.
  • patch units sharing a common retinal image can be assigned to patch groups. How those patch groups can be laid out across the TOM display — or the layout architecture — will depend on the patch group function and their use in enabling a particular application. In addition, the chosen real world view transparency can determine the number and density of the patch units.
  • FIG 18 shows one example of a dense patch group layout.
  • the patch group’s patch units are identified by color within a square (patch group) showing the extent of the patch group (the patch units are notated by circles within the patch group squares (e.g., 1801)).
  • a 3x3 set of circular lens patch units are grouped shoulder to shoulder (or next to one another). In this configuration several patch group members (patch units) will likely illuminate the eye pupil simultaneously or nearly simultaneously. This layout will prove useful for color generation, brightness enhancement, and dithering options.
  • Figure 19 shows a distributed and interlaced set of patch groups.
  • the patch units are identified by differently colored circles; circles with the same color are patch units of the same or common patch group in this particular embodiment.
  • a few members of a patch group may illuminate the eye pupil simultaneously. This configuration would be useful for increasing eyebox size, gaze dependent viewing, or field of view.
  • a hybrid approach of a concentrated and dispersed layout will be preferable.
  • the layout configuration will be determined during the design of the architecture for a specific application. Even though the layout has been shown configured as a rectangular grid array in the Figures, a hexagonal packing or arbitrary pattern may be selected. This arbitrary nature may prove necessary on curved surface TOMs.
  • the patch unit layout in a patch group may be determined by functionality.
  • similar color circles designate elements that make up a patch group.
  • pixel patches and/or patch units are interlaced, which is a way to increase eyebox size.
  • patch groups can be applied to both static and dynamic MLA-based architectures.
  • benefits include but are not limited to:
  • Pixel patches generally are smaller in size than lenslets, but not always.
  • Embodiments of the invention also include a computer readable medium comprising one or more computer files containing applications, frameworks, libraries, and such, comprising a set of computer-executable instructions for performing one or more of the calculations, steps, processes and operations described and/or depicted herein.
  • the files may be stored contiguously or non-contiguously on the computer- readable and/or device-readable medium.
  • Embodiments may include a computer program product comprising the computer files, either in the form of the computer-readable medium comprising the computer files and, optionally, made available to a consumer through packaging, or alternatively made available to a consumer through electronic distribution.
  • a “computer-readable medium” is a non-transitory computer- readable medium and includes any kind of computer memory such as floppy disks, conventional hard disks, CD-ROM, Flash ROM, non-volatile ROM, electrically erasable programmable read only memory (EEPROM), memory card, and RAM.
  • the computer readable medium has a set of instructions stored thereon which, when executed by a processor, cause the processor to perform tasks, based on data stored in the electronic database on the computer or cloud, or memory described herein.
  • the processor may implement this process through any of the procedures discussed in this disclosure or through any equivalent procedure.
  • files comprising the set of computer- executable instructions may be stored in computer-readable memory on a single computer or distributed across multiple computers, in personal communication device and/or devices, or be stored in cloud computer.
  • files comprising the set of computer- executable instructions may be stored in computer-readable memory on a single computer or distributed across multiple computers, in personal communication device and/or devices, or be stored in cloud computer.
  • a skilled artisan will further appreciate, in light of this disclosure, how the invention can be implemented, in addition to software, using hardware or firmware. As such, as used herein, the operations of the invention can be implemented in a system comprising a combination of software, hardware, and/or firmware.
  • Embodiments of this disclosure include one or more computers or devices loaded with a set of the computer-executable instructions described herein.
  • the computers or devices may be a general purpose computer, a special-purpose computer, personal communication device, or other programmable data processing apparatus to produce a particular machine, such that the one or more computers or devices are instructed and configured to carry out the calculations, sensor data collecting and processing, processes, steps, operations, algorithms, statistical methods, formulas, or computational routines of this disclosure.
  • the computer or device performing the specified calculations, processes, steps, operations, algorithms, statistical methods, formulas, or computational routines of this disclosure may comprise at least one processing element such as a central processing unit (e.g., processor or System on Chip (“SOC”)) and a form of computer-readable memory which may include random-access memory (“RAM”) or read-only memory (“ROM”).
  • a central processing unit e.g., processor or System on Chip (“SOC”)
  • RAM random-access memory
  • ROM read-only memory
  • the computer-executable instructions can be embedded in computer hardware or stored in the computer-readable memory such that the computer or device may be directed to perform one or more of the calculations, steps, processes and operations depicted and/or described herein.
  • Additional embodiments of this disclosure comprise a computer system for carrying out the computer-implemented method of this disclosure.
  • the computer system may comprise a processor for executing the computer-executable instructions, one or more electronic databases containing the data or information described herein, an input/output interface or user interface, and a set of instructions (e.g., software) for carrying out the method.
  • the computer system can include a stand-alone computer, such as a desktop computer, a portable computer, such as a tablet, laptop, PDA, wearable device (e.g., electronic watch, smart glasses or HMD - Head Mounted Display), or smartphone, or a set of computers connected through a network including a client-server configuration and one or more database servers.
  • the network may use any suitable network protocol, including IP, UDP, or ICMP, and may be any suitable wired or wireless network including any local area network, wide area network, Internet network, telecommunications network, Wi-Fi enabled network, or Bluetooth enabled network.
  • the computer system comprises a central computer connected to the internet that has the computer-executable instructions stored in memory that is operably connected to an internal electronic database.
  • the central computer may perform the computer-implemented method based on input and commands received from remote computers through the internet.
  • the central computer may effectively serve as a server and the remote computers may serve as client computers such that the server-client relationship is established, and the client computers issue queries or receive output from the server over a network.
  • the input/output user interfaces may include a graphical user interface (GUI), voice command interface, gesture interface, gaze interface, or combinations thereof, which may be used in conjunction with the computer-executable code and electronic databases.
  • GUI graphical user interface
  • the graphical user interface gesture interface, gaze interface, or combinations thereof may allow a user to perform these tasks through the use of text fields, check boxes, pull-downs, command buttons, voice commands, various gestures gaze as a selection mechanism, and the like.
  • the user interface may optionally be accessible through a computer connected to the internet. In one embodiment, the user interface is accessible by typing in an internet address through an industry standard web browser and logging into a web page.
  • the user interface may then be operated through a remote computer (client computer) accessing the web page and transmitting queries or receiving output from a server through a network connection.
  • client computer accessing the web page and transmitting queries or receiving output from a server through a network connection.

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Abstract

L'invention concerne un système ou un dispositif de module optique transparent comprenant une hiérarchie d'architecture optique basée sur une unité de plaque. Dans certains aspects, le module optique transparent comprend un affichage ayant peu de pixels. L'unité de plaque comprend une ou plusieurs régions de pixels d'affichage ou un ou plusieurs motifs de pixels et une petite lentille associée, par exemple sur un réseau de microlentilles. La petite lentille permet de transmettre une lumière émise par un affichage à un œil du porteur du module optique transparent, qui focalise ensuite la lumière pour former une image rétinienne, qui est vue ou perçue par le porteur. Les unités de plaque peuvent en outre être combinées en groupes de plaques, des éléments d'un groupe servant de rôle similaire dans la production d'image rétinienne en tant qu'une unité de plaque et/ou de petite lentille. Cette hiérarchie permet au système d'être mis à l'échelle pour des systèmes plus grands et plus complexes.
PCT/US2021/060730 2020-11-24 2021-11-24 Module optique transparent utilisant des plaques de pixels et petites lentilles associées WO2022115534A1 (fr)

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