Patent Grant
11747568
The present disclosure relates to waveguide devices and, more particularly, to holographic waveguide displays.
Waveguides can be referred to as structures with the capability of confining and guiding waves (i.e., restricting the spatial region in which waves can propagate). One subclass includes optical waveguides, which are structures that can guide electromagnetic waves, typically those in the visible spectrum. Waveguide structures can be designed to control the propagation path of waves using a number of different mechanisms. For example, planar waveguides can be designed to utilize diffraction gratings to diffract and couple incident light into the waveguide structure such that the in-coupled light can proceed to travel within the planar structure via total internal reflection (TIR).
Fabrication of waveguides can include the use of material systems that allow for the recording of holographic optical elements within the waveguides. One class of such material includes polymer dispersed liquid crystal (PDLC) mixtures, which are mixtures containing photopolymerizable monomers and liquid crystals. A further subclass of such mixtures includes holographic polymer dispersed liquid crystal (HPDLC) mixtures. Holographic optical elements, such as volume phase gratings, can be recorded in such a liquid mixture by illuminating the material with two mutually coherent laser beams. During the recording process, the monomers polymerize, and the mixture undergoes a photopolymerization-induced phase separation, creating regions densely populated by liquid crystal micro-droplets, interspersed with regions of clear polymer. The alternating liquid crystal-rich and liquid crystal-depleted regions form the fringe planes of the grating. The resulting grating, which is commonly referred to as a switchable Bragg grating (SBG), has all the properties normally associated with volume or Bragg gratings but with much higher refractive index modulation ranges combined with the ability to electrically tune the grating over a continuous range of diffraction efficiency (the proportion of incident light diffracted into a desired direction). The latter can extend from non-diffracting (cleared) to diffracting with close to 100% efficiency.
Waveguide optics, such as those described above, can be considered for a range of display and sensor applications. In many applications, waveguides containing one or more grating layers encoding multiple optical functions can be realized using various waveguide architectures and material systems, enabling new innovations in near-eye displays for augmented reality (AR) and virtual reality (VR), compact head-up displays (HUDs) and helmet-mounted displays or head-mounted displays (HMDs) for road transport, aviation, and military applications, and sensors for biometric and laser radar (LIDAR) applications.
Systems and methods for implementing holographic waveguide displays incorporating transmissive and reflective gratings in accordance with various embodiments of the invention are illustrated. One embodiment includes a waveguide display including a source of light modulated with image data and a waveguide including at least one transmission grating, at least one reflection grating, wherein the at least one reflection and the at least one transmission grating at least partially overlap, and at least one input coupler for coupling light from the source of light into a TIR path in the waveguide.
In another embodiment, the at least one reflection grating and the at least one transmission grating are multiplexed in a single grating layer.
In a further embodiment, the at least one input coupler is a grating.
In still another embodiment, the at least one input coupler includes an input transmission grating, the at least one transmission grating includes a fold transmission grating and an output transmission grating, and at least one of the input, fold, and output transmission gratings is multiplexed with the at least one reflection grating.
In a still further embodiment, the at least one input coupler includes an input transmission grating, the at least one transmission grating includes first and second fold transmission gratings, the at least one reflection grating overlaps at least one of the input transmission grating and the first and second fold transmission gratings, the first and second fold transmission gratings overlap each other, the first and second fold transmission gratings have crossed K-vectors, each of the fold transmission gratings is configured to beam-expand light from the input grating and couple it towards the other fold transmission grating, which then beam-expand and extract light towards a viewer.
In yet another embodiment, each of the gratings has a grating vector that in combination provide a resultant vector with substantially zero magnitude.
In a yet further embodiment, the light undergoes a dual interaction within at least one of the gratings.
In another additional embodiment, the waveguide display further includes a beam splitter layer overlapping the at least one reflection grating.
In a further additional embodiment, the waveguide display further includes an alignment layer overlapping the at least one reflection grating.
In another embodiment again, the source of data modulated light is one of a laser-scanning projector, a microdisplay panel, and/or an emissive display.
In a further embodiment again, the source of light provides at least two different wavelengths.
In still yet another embodiment, at least one of the gratings is characterized by a spatial variation of a property that is one of refractive index modulation, K-vector, grating vector, grating pitch, and/or birefringence.
In a still yet further embodiment, the gratings are configured to provide separate optical paths for a property that is one of wavelength band, angular bandwidth, and/or polarization state.
In still another additional embodiment, the waveguide is curved.
In a still further additional embodiment, the waveguide incorporates a GRIN structure.
In still another embodiment again, the waveguide is plastic.
In a still further embodiment again, at least one of the gratings includes a structure that is one of a switchable Bragg grating recorded in a holographic photopolymer a HPDLC material, a switchable Bragg grating recorded in a uniform modulation holographic liquid crystal polymer material, a Bragg grating recorded in a photopolymer material, and/or a surface relief grating.
A yet another additional embodiment includes a method of fabricating a holographic waveguide, the method including providing at least one light source, a layer of holographic recording material, and an at least partially reflective surface, forming first and second recording beams using the at least one light source, transmitting the first and second recording beams into the layer of holographic recording material, transmitting a portion of the first recording beam through the layer of holographic recording material towards the at least partially reflective surface, reflecting the transmitted portion of the first beam off the at least partially reflective surface back into the layer of holographic recording material, forming a transmission grating in the layer of holographic recording material using the first and second recording beams, and forming a reflection grating in the layer of holographic recording material using the reflected portion of the first recording beam and the second recording beam.
In a yet further additional embodiment, the method further includes forming a liquid crystal and polymer anchoring structure for supporting a reflection grating.
A yet another embodiment again includes a method of fabricating a holographic waveguide, the method including providing a master grating, a substrate supporting a layer of recording material, a source of light, and an at least partially reflective surface disposed opposite to the master grating with respect to the layer of recording material, illuminating the master grating with light from the source of light to form a diffracted beam and a zero-order beam, reflecting the diffracted beam from the at least partially reflective surface, forming a transmission grating from the zero-order beam and the diffracted beam, and forming a reflection grating from the zero-order beam and the reflected diffracted beam.
Additional embodiments and features are set forth in part in the description that follows, and in part will become apparent to those skilled in the art upon examination of the specification or may be learned by the practice of the invention. A further understanding of the nature and advantages of the present invention may be realized by reference to the remaining portions of the specification and the drawings, which forms a part of this disclosure.
The description will be more fully understood with reference to the following figures and data graphs, which are presented as exemplary embodiments of the invention and should not be construed as a complete recitation of the scope of the invention.
For the purposes of describing embodiments, some well-known features of optical technology known to those skilled in the art of optical design and visual displays have been omitted or simplified in order to not obscure the basic principles of the invention. Unless otherwise stated, the term “on-axis” in relation to a ray or a beam direction refers to propagation parallel to an axis normal to the surfaces of the optical components described in relation to the invention. In the following description the terms light, ray, beam, and direction may be used interchangeably and in association with each other to indicate the direction of propagation of electromagnetic radiation along rectilinear trajectories. The term light and illumination may be used in relation to the visible and infrared bands of the electromagnetic spectrum. Parts of the following description will be presented using terminology commonly employed by those skilled in the art of optical design. As used herein, the term grating may encompass a grating having a set of gratings in some embodiments. For illustrative purposes, it is to be understood that the drawings are not drawn to scale unless stated otherwise.
Waveguide technology can enable low cost, efficient, and versatile diffractive optical solutions for many different applications. In many embodiments, a waveguide display supporting at least one transmission grating and at least one reflection grating is implemented. The transmission and reflection gratings can be implemented across different grating layers or within a single grating layer. In some embodiments, the transmission and reflection gratings are multiplexed. A multiplexed transmission and reflection grating can be configured for the specific purpose of supporting transmission gratings at angles that otherwise could not be supported in typical Bragg gratings. In several embodiments, such structures can be used to make high efficiency reflection input gratings for use in waveguides.
In many embodiments, multiplexed reflection and transmission gratings can provide improved uniformity with laser light, that is, reduced banding and other illumination artifacts occurring in waveguides. The mechanism for this can be the multiple reflections between the waveguide reflecting surfaces and the reflection hologram, which promote illumination averaging as beam propagation processes within a waveguide. In some embodiments, a beam splitter layer overlapping the multiplexed gratings can be provided for the purposes of reducing banding in a laser-illuminated waveguide. The beam splitter can be provided by one or more dielectric layers. In several embodiments, the beamsplitter can have sensitivity to one polarization. In further embodiments, the beamsplitter can be sensitive to S-polarization. In a number of embodiments, the beam splitter can be an anti-reflection coating optimized for normal incidence that becomes reflective at high TIR angles when immersed in glass or plastic.
Various systems and methods can be implemented to fabricate waveguides incorporating transmissive and reflective gratings. In many embodiments, a system for fabricating such gratings can include at least one source of light, a master grating providing a zero-order beam and at least one diffracted order beam from the light, a substrate supporting a layer of holographic recording material (such as but not limited to HPDLC materials) overlapping the master, and an at least partially reflective surface overlapping the holographic recording material layer. During the recording operation, the diffracted beam can be reflected by the at least partially reflective surface. Through a combination of interference from the zero-order beam, the diffracted beam, and the reflected beam, both transmission and reflection gratings can be recorded. In many embodiments, the transmission and reflection gratings are multiplexed. In some embodiments, the system includes an HPDLC mixture that includes a weak dielectric material that enables efficient multiplexing of reflection and transmission gratings without generating unwanted reflections (and hence spurious gratings). In several embodiments, overlaid alignment layers may be used to fine tune HPDLC multiplexed reflection and transmission grating formation. For example, in some embodiments, selective alignment of HPDLC gratings can be used to balance the refractive index modulations and or the polarization response of the multiplexed transmission and reflection gratings. In a number of embodiments, alignment layers may be used to promote S-polarization sensitivity in the reflection grating. In a typical waveguide implementation, the average extraordinary axis of the LC rich fringes (which in typical HPDLC gratings will be orthogonal to the Bragg fringe plane) will be normal to the waveguide reflecting surfaces. This orientation can be advantageous for providing strong interaction with light propagating through a fold grating at typical waveguide total internal reflection angles.
Waveguide embodiments implementing transmission and reflection gratings can be utilized and configured for a variety of applications. For example, in some applications, it is desirable for the waveguide to be compact and wide angle with a generous eyebox while also providing full color. Previous solutions to color imaging have include stacking two or more monochrome waveguides, where each waveguide supports a grating layer with gratings configured to operate in a single color. In many cases, each waveguide is further configured for inputting image modulated light, expanding the light in two dimensions, and extracting it from the waveguide towards an eye box. However, such multi-waveguide stacking solutions suffer from the tight tolerances required to align the overlapping gratings in the waveguide stack, which can result in low manufacturing yield. Two-layer solutions in which one layer propagates red light and the second layer propagate light in the green-blue band have been attempted but still present alignment problems in manufacturing. As such, many embodiments of the invention are directed towards methods and architectures for implementing wide-angle, single grating layer color waveguide displays. Waveguide and grating architectures, holographic recording materials, and waveguide embodiments incorporating transmission and reflection gratings are discussed in the sections below in further detail.
Optical Waveguide and Grating Structures
Optical structures recorded in waveguides can include many different types of optical elements, such as but not limited to diffraction gratings. Gratings can be implemented to perform various optical functions, including but not limited to coupling light, directing light, and preventing the transmission of light. In many embodiments, the gratings are surface relief gratings that reside on the outer surface of the waveguide. In other embodiments, the grating implemented is a Bragg grating (also referred to as a volume grating), which are structures having a periodic refractive index modulation. Bragg gratings can be fabricated using a variety of different methods. One process includes interferential exposure of holographic photopolymer materials to form periodic structures. Bragg gratings can have high efficiency with little light being diffracted into higher orders. The relative amount of light in the diffracted and zero order can be varied by controlling the refractive index modulation of the grating, a property that can be used to make lossy waveguide gratings for extracting light over a large pupil. A grating can be characterized by a grating vector defining the orientation of the grating fringes in the plane of the waveguide. A grating can also be characterized by a K-vector in 3D space, which in the case of a Bragg grating is defined as the vector normal to the Bragg fringes. The K-vector vector can determine the optical efficiency for a given range of input and diffracted angles.
One class of Bragg gratings used in holographic waveguide devices is the Switchable Bragg Grating (SBG). SBGs can be fabricated by first placing a thin film of a mixture of photopolymerizable monomers and liquid crystal material between substrates. The substrates can be made of various types of materials, such glass and plastics. In many cases, the substrates are in a parallel configuration. In other embodiments, the substrates form a wedge shape. One or both substrates can support electrodes, typically transparent tin oxide films, for applying an electric field across the film. The grating structure in an SBG can be recorded in the liquid material (often referred to as the syrup) through photopolymerization-induced phase separation using interferential exposure with a spatially periodic intensity modulation. Factors such as but not limited to control of the irradiation intensity, component volume fractions of the materials in the mixture, and exposure temperature can determine the resulting grating morphology and performance. As can readily be appreciated, a wide variety of materials and mixtures can be used depending on the specific requirements of a given application. In many embodiments, HPDLC material is used. During the recording process, the monomers polymerize, and the mixture undergoes a phase separation. The LC molecules aggregate to form discrete or coalesced droplets that are periodically distributed in polymer networks on the scale of optical wavelengths. The alternating liquid crystal-rich and liquid crystal-depleted regions form the fringe planes of the grating, which can produce Bragg diffraction with a strong optical polarization resulting from the orientation ordering of the LC molecules in the droplets.
The resulting volume phase grating can exhibit very high diffraction efficiency, which can be controlled by the magnitude of the electric field applied across the film. When an electric field is applied to the grating via transparent electrodes, the natural orientation of the LC droplets can change, causing the refractive index modulation of the fringes to lower and the hologram diffraction efficiency to drop to very low levels. Typically, the electrodes are configured such that the applied electric field will be perpendicular to the substrates. In a number of embodiments, the electrodes are fabricated from indium tin oxide (ITO). In the OFF state with no electric field applied, the extraordinary axis of the liquid crystals generally aligns normal to the fringes. The grating thus exhibits high refractive index modulation and high diffraction efficiency for P-polarized light. When an electric field is applied to the HPDLC, the grating switches to the ON state wherein the extraordinary axes of the liquid crystal molecules align parallel to the applied field and hence perpendicular to the substrate. In the ON state, the grating exhibits lower refractive index modulation and lower diffraction efficiency for both S- and P-polarized light. Thus, the grating region no longer diffracts light. Each grating region can be divided into a multiplicity of grating elements such as for example a pixel matrix according to the function of the HPDLC device. Typically, the electrode on one substrate surface is uniform and continuous, while electrodes on the opposing substrate surface are patterned in accordance to the multiplicity of selectively switchable grating elements.
Typically, the SBG elements are switched clear in 30 μs with a longer relaxation time to switch ON. The diffraction efficiency of the device can be adjusted, by means of the applied voltage, over a continuous range. In many cases, the device exhibits near 100% efficiency with no voltage applied and essentially zero efficiency with a sufficiently high voltage applied. In certain types of HPDLC devices, magnetic fields can be used to control the LC orientation. In some HPDLC applications, phase separation of the LC material from the polymer can be accomplished to such a degree that no discernible droplet structure results. An SBG can also be used as a passive grating. In this mode, its chief benefit is a uniquely high refractive index modulation. SBGs can be used to provide transmission or reflection gratings for free space applications. SBGs can be implemented as waveguide devices in which the HPDLC forms either the waveguide core or an evanescently coupled layer in proximity to the waveguide. The substrates used to form the HPDLC cell provide a total internal reflection (TIR) light guiding structure. Light can be coupled out of the SBG when the switchable grating diffracts the light at an angle beyond the TIR condition.
In some embodiments, LC can be extracted or evacuated from the SBG to provide an evacuated Bragg grating (EBG). EBGs can be characterized as a surface relief grating (SRG) that has properties very similar to a Bragg grating due to the depth of the SRG structure (which is much greater than that practically achievable using surface etching and other conventional processes commonly used to fabricate SRGs). The LC can be extracted using a variety of different methods, including but not limited to flushing with isopropyl alcohol and solvents. In many embodiments, one of the transparent substrates of the SBG is removed, and the LC is extracted. In further embodiments, the removed substrate is replaced. The SRG can be at least partially backfilled with a material of higher or lower refractive index. Such gratings offer scope for tailoring the efficiency, angular/spectral response, polarization, and other properties to suit various waveguide applications.
Waveguides in accordance with various embodiments of the invention can include various grating configurations designed for specific purposes and functions. In many embodiments, the waveguide is designed to implement a grating configuration capable of preserving eyebox size while reducing lens size by effectively expanding the exit pupil of a collimating optical system. The exit pupil can be defined as a virtual aperture where only the light rays which pass though this virtual aperture can enter the eyes of a user. In some embodiments, the waveguide includes an input grating optically coupled to a light source, a fold grating for providing a first direction beam expansion, and an output grating for providing beam expansion in a second direction, which is typically orthogonal to the first direction, and beam extraction towards the eyebox. As can readily be appreciated, the grating configuration implemented waveguide architectures can depend on the specific requirements of a given application. In many embodiments, the gratings used in any of the embodiments can have grating vectors matched to provide a resultant vector with substantially zero magnitude. In some embodiments, the grating configuration includes multiple fold gratings. In several embodiments, the grating configuration includes an input grating and a second grating for performing beam expansion and beam extraction simultaneously. The second grating can include gratings of different prescriptions, for propagating different portions of the field-of-view, arranged in separate overlapping grating layers or multiplexed in a single grating layer. In a number of embodiments, two grating layers are disposed on either side of a single substrate layer. Furthermore, various types of gratings and waveguide architectures can also be utilized.
In several embodiments, the gratings within each layer are designed to have different spectral and/or angular responses. For example, in many embodiments, different gratings across different grating layers are overlapped, or multiplexed, to provide an increase in spectral bandwidth. In some embodiments, a full color waveguide is implemented using three grating layers, each designed to operate in a different spectral band (red, green, and blue). In other embodiments, a full color waveguide is implemented using two grating layers, a red-green grating layer and a green-blue grating layer. As can readily be appreciated, such techniques can be implemented similarly for increasing angular bandwidth operation of the waveguide. In addition to the multiplexing of gratings across different grating layers, multiple gratings can be multiplexed within a single grating layer—i.e., multiple gratings can be superimposed within the same volume. In several embodiments, the waveguide includes at least one grating layer having two or more grating prescriptions multiplexed in the same volume. In further embodiments, the waveguide includes two grating layers, each layer having two grating prescriptions multiplexed in the same volume. Multiplexing two or more grating prescriptions within the same volume can be achieved using various fabrication techniques. In a number of embodiments, a multiplexed master grating is utilized with an exposure configuration to form a multiplexed grating. In many embodiments, a multiplexed grating is fabricated by sequentially exposing an optical recording material layer with two or more configurations of exposure light, where each configuration is designed to form a grating prescription. In some embodiments, a multiplexed grating is fabricated by exposing an optical recording material layer by alternating between or among two or more configurations of exposure light, where each configuration is designed to form a grating prescription. As can readily be appreciated, various techniques, including those well known in the art, can be used as appropriate to fabricate multiplexed gratings.
In some embodiments, the light propagating within a waveguide in accordance with an embodiment of the invention can undergo a dual interaction within at least one of the gratings (i.e., the grating is designed to have high diffraction efficiency, or diffraction efficiency peaks, for two different incidence angles). In many embodiments, the waveguide can incorporate at least one of: angle multiplexed gratings, color multiplexed gratings, fold gratings, dual interaction gratings, rolled K-vector gratings, crossed fold gratings, tessellated gratings, chirped gratings, gratings with spatially varying refractive index modulation, gratings having spatially varying grating thickness, gratings having spatially varying average refractive index, gratings with spatially varying refractive index modulation tensors, gratings having spatially varying average refractive index tensors, and gratings having spatially varying birefringence properties. In some embodiments, the waveguide can incorporate at least one of: a half wave plate, a quarter wave plate, an anti-reflection coating, a beam splitting layer, an alignment layer, a photochromic back layer for glare reduction, and louvre films for glare reduction. In several embodiments, the waveguide can support gratings providing separate optical paths for different polarizations. In various embodiments, the waveguide can support gratings providing separate optical paths for different spectral and/or angular bandwidths. In a number of embodiments, the gratings can be HPDLC gratings, switching gratings recorded in HPDLC (such switchable Bragg Gratings), Bragg gratings recorded in holographic photopolymer, or surface relief gratings. In many embodiments, the waveguide operates in a monochrome band. In some embodiments, the waveguide operates in the green band. In several embodiments, waveguide layers operating in different spectral bands such as red, green, and blue (RGB) can be stacked to provide a three-layer waveguiding structure. In further embodiments, the layers are stacked with air gaps between the waveguide layers. In various embodiments, the waveguide layers operate in broader bands such as blue-green and green-red to provide two-waveguide layer solutions. In other embodiments, the gratings are color multiplexed to reduce the number of grating layers. Various types of gratings can be implemented. In some embodiments, at least one grating in each layer is a switchable grating. In many embodiments, the waveguide can be curved. In several embodiments, the waveguide can incorporate a gradient index (GRIN) structure. In a number of embodiments, the waveguide can be fabricated using plastic substrates.
Waveguides incorporating optical structures such as those discussed above can be implemented in a variety of different applications, including but not limited to waveguide displays. In various embodiments, the waveguide display is implemented with an eyebox of greater than 10 mm with an eye relief greater than 25 mm. In some embodiments, the waveguide display includes a waveguide with a thickness between 2.0-5.0 mm. In many embodiments, the waveguide display can provide an image field-of-view of at least 50° diagonal. In further embodiments, the waveguide display can provide an image field-of-view of at least 70° diagonal. The waveguide display can employ many different types of picture generation units (PGUs). In several embodiments, the PGU can be a reflective or transmissive spatial light modulator such as a liquid crystal on Silicon (LCoS) panel or a micro electromechanical system (MEMS) panel. In a number of embodiments, the PGU can be an emissive device such as an organic light emitting diode (OLED) panel. In some embodiments, an OLED display can have a luminance greater than 4000 nits and a resolution of 4 k×4 k pixels. In several embodiments, the waveguide can have an optical efficiency greater than 10% such that a greater than 400 nit image luminance can be provided using an OLED display of luminance 4000 nits. Waveguides implementing P-diffracting gratings (i.e., gratings with high efficiency for P-polarized light) typically have a waveguide efficiency of 5%-6.2%. Since P-diffracting or S-diffracting gratings can waste half of the light from an unpolarized source such as an OLED panel, many embodiments are directed towards waveguides capable of providing both S-diffracting and P-diffracting gratings to allow for an increase in the efficiency of the waveguide by up to a factor of two. In some embodiments, the S-diffracting and P-diffracting gratings are implemented in separate overlapping grating layers. Alternatively, a single grating can, under certain conditions, provide high efficiency for both p-polarized and s-polarized light. In several embodiments, the waveguide includes Bragg-like gratings produced by extracting LC from HPDLC gratings, such as those described above, to enable high S and P diffraction efficiency over certain wavelength and angle ranges for suitably chosen values of grating thickness (typically, in the range 2-5 μm).
Optical Recording Material Systems
HPDLC mixtures generally include LC, monomers, photoinitiator dyes, and coinitiators. The mixture (often referred to as syrup) frequently also includes a surfactant. For the purposes of describing the invention, a surfactant is defined as any chemical agent that lowers the surface tension of the total liquid mixture. The use of surfactants in PDLC mixtures is known and dates back to the earliest investigations of PDLCs. For example, a paper by R. L Sutherland et al., SPIE Vol. 2689, 158-169, 1996, the disclosure of which is incorporated herein by reference, describes a PDLC mixture including a monomer, photoinitiator, coinitiator, chain extender, and LCs to which a surfactant can be added. Surfactants are also mentioned in a paper by Natarajan et al, Journal of Nonlinear Optical Physics and Materials, Vol. 5 No. I 89-98, 1996, the disclosure of which is incorporated herein by reference. Furthermore, U.S. Pat. No. 7,018,563 by Sutherland; et al., discusses polymer-dispersed liquid crystal material for forming a polymer-dispersed liquid crystal optical element having: at least one acrylic acid monomer; at least one type of liquid crystal material; a photoinitiator dye; a coinitiator; and a surfactant. The disclosure of U.S. Pat. No. 7,018,563 is hereby incorporated by reference in its entirety.
The patent and scientific literature contains many examples of material systems and processes that can be used to fabricate SBGs, including investigations into formulating such material systems for achieving high diffraction efficiency, fast response time, low drive voltage, and so forth. U.S. Pat. No. 5,942,157 by Sutherland, and U.S. Pat. No. 5,751,452 by Tanaka et al. both describe monomer and liquid crystal material combinations suitable for fabricating SBG devices. Examples of recipes can also be found in papers dating back to the early 1990s. Many of these materials use acrylate monomers, including:
Acrylates offer the benefits of fast kinetics, good mixing with other materials, and compatibility with film forming processes. Since acrylates are cross-linked, they tend to be mechanically robust and flexible. For example, urethane acrylates of functionality 2 (di) and 3 (tri) have been used extensively for HPDLC technology. Higher functionality materials such as penta and hex functional stems have also been used.
Waveguides Incorporating Reflection and Transmission Gratings
Referring generally to the drawings, systems and methods relating to displays or sensors implementing full color in a single grating layer in accordance with various embodiments of the invention are illustrated. In many embodiments, a waveguide display according to the principles of the invention includes at least one waveguide substrate, a source of light modulated with image data, at least one input coupler for coupling the light into TIR in waveguide, at least one transmission grating, and at least one reflection grating, where the reflection and the transmission grating at least partially overlap.
The gratings as described above and throughout this disclosure can include various grating structures, including but not limited to volume gratings and surface relief gratings. In many embodiments, at least one of the gratings is recorded in a holographic photopolymer, an HPDLC material, or a uniform modulation holographic liquid crystal polymer material. Reflection gratings recorded in HPDLC materials can suffer from the problem that the resulting Bragg fringes tend to be very long and exhibit poor surface anchoring. In some cases, this can lead to delamination of the grating structure. In embodiments using HPDLCs (such as the one in
Multiplexed gratings, such as the one shown in
During the recording process, the master grating 402 can be illuminated to form zero-order and diffracted light. At least a portion of the zero-order light and at least a portion of the diffracted light can together form an interference pattern within the holographic recording material layer 405 to form a transmission grating. At least a portion of the zero-order light can be reflected from the partially reflecting coating 407 and interferes with at least a portion of the diffracted light within the holographic recording material 405 to form a reflection grating. The reflection and transmission gratings can be formed in a single multiplexed layer. As can readily be appreciated, in some embodiments, multiple grating layers are utilized to form overlapping transmission and reflection gratings
Although
Although
Waveguides implementing transmission and reflection gratings in accordance with various embodiments of the invention can be implemented with a variety of grating configurations. In many embodiments, the waveguide supports at least one input transmission grating, at least one fold transmission grating, and at least one output transmission grating. At least one of the input, fold, and output transmission gratings can be multiplexed with a reflection grating. In other embodiments, the reflection grating overlaps at least one of the input and fold gratings. In some embodiments, the waveguide supports first and second fold transmission gratings. The first and the second fold transmission gratings can overlap each other and at least one reflection grating. In a number of embodiments, the first and second fold transmission gratings have crossed K-vectors. Each of the fold transmission gratings can be configured to beam-expand light from the input grating in a first direction and couple it towards the other fold transmission grating, which can then beam-expand the light in a different direction and extract it towards a viewer.
Some key problems in conventional waveguide architectures based on input, fold, and output gratings can be addressed by combining the functions of the fold and output gratings. In many embodiments, the display includes a waveguide supporting an input grating and two overlapping gratings that perform the dual function of expansion and extraction, with each of the overlapped gratings performing either vertical expansion or horizontal expansion according to the field of portion being propagated through waveguide. The grating vectors of the input and overlapped gratings can be arranged in either equilateral or symmetrical configurations to provide substantially zero resultant vector.
Although
In many embodiments, the apparatus includes a waveguide in which input light is split into two wavelength bands, which follow bifurcated paths each with a dedicated fold grating. Light can be extracted using a pair of overlapping output gratings with one grating allocated to each wavelength band. The output gratings can have gratings vectors at 90 deg. to each other. The gratings can use of surface relief or holographic type. In many embodiments, the apparatus includes a waveguide supporting overlapping diffractive elements with grating vectors aligned in the same direction for performing horizontal expansion and extraction. The gratings can sandwich an electro active material enabling switching between clear and diffracting states. With regard to crossed grating waveguide architectures, the present disclosure can incorporate the embodiments and teachings disclosed in U.S. patent application Ser. No. 16/709,517 entitled “Methods And Apparatuses For Providing A Single Grating Layer Color Holographic Waveguide Display” and U.S. patent application Ser. No. 14/620,969 entitled “Waveguide Grating Device,” the disclosures of which are incorporated herein by reference in their entireties for all purposes.
The prescriptions and material properties can be determined by reverse ray tracing from the eye box to the image source. The grating layer can be supported by a transparent substrate. The substrates can be a high index material, optical glass or plastic. In some embodiments, the substrate is curved. The grating can be covered by a second substrate, the first and second substrates forming a light guiding structure. The grating can be divided into separate grating elements each have different material and grating properties. At least some of grating elements can be electrically switchable. The gratings can be formed in a holographic photopolymer, a HPDLC material system, uniform modulation HPDLC material system, or any other material systems that includes at least one LC and one polymer component. The material or grating properties can vary in step change or may vary continuously. The multiplexed transmission and reflection gratings can have prescriptions optimized for the purpose of propagating image light of different wavelength bands, light of different angular bandwidths, and light of different polarizations. The gratings can be formed using an inkjet deposition process.
The reflection holograms can be essentially considered stratified index systems. In many embodiments, the outer layers of the reflection gratings can provide environmental isolation by attenuating the guided beam so that total internal reflection occurs mainly before the light hits the outer surfaces of the waveguide. In some embodiments, aberration can be corrected by building compensation functions into the transmission grating and reflection grating prescriptions. Reflective holographic optical elements (R-HOEs) may also enable curved waveguides.
In some embodiments, the waveguide angular bandwidth can be expanded by using two reflection gratings disposed above and below the transmission grating.
In some embodiments, the apparatus includes at least one grating with spatially varying pitch. In some embodiments, each grating has a fixed K vector. In many embodiments, at least one of the gratings is a rolled k-vector grating according to the embodiments and teachings disclosed in the cited references. Rolling the K-vectors allows the angular bandwidth of the grating to be expanded without the need to increase the waveguide thickness. In some embodiments, a rolled K-vector grating includes a waveguide portion containing discrete grating elements having differently aligned K-vectors. In some embodiments, a rolled K-vector grating includes a waveguide portion containing a single grating element within which the K-vectors undergo a smooth monotonic variation in direction. In some of the embodiments, describe rolled K-vector gratings are used to input light into the waveguide.
In some embodiments directed at displays using unpolarized light sources, the input gratings used in the invention combine gratings orientated such that each grating diffracts a particular polarization of the incident unpolarized light into a waveguide path. Such embodiments may incorporate some of the embodiments and teachings disclosed in the PCT application PCT/GB2017/000040 “Method and Apparatus for Providing a Polarization Selective Holographic Waveguide Device,” the disclosure of which is incorporated herein by reference in its entirety for all purposes. The output gratings can be configured in a similar fashion so the light from the waveguide paths is combined and coupled out of the waveguide as unpolarized light. For example, in some embodiments the input grating and output grating each combine crossed gratings with peak diffraction efficiency for orthogonal polarizations states. In some embodiments, the polarization states are S-polarized and P-polarized. In some embodiments, the polarization states are opposing senses of circular polarization. The advantage of gratings recorded in liquid crystal polymer systems, such as SBGs, in this regard is that owing to their inherent birefringence they exhibit strong polarization selectivity. However, other grating technologies that can be configured to provide unique polarization states may be used.
In some embodiments using gratings recorded in liquid crystal polymer material systems at least one polarization control layer overlapping at least one of the fold gratings, input gratings or output gratings may be provided for the purposes of compensating for polarization rotation in any the gratings, particularly the fold gratings, which the inventors have found may result in polarization rotation. In some embodiments, all of the gratings are overlaid by polarization control layers. In some embodiments polarization control layers are applied to the fold gratings only or to any other subset of the gratings. The polarization control layer may include an optical retarder film. In some embodiments based on HPDLC materials, the birefringence of the gratings may be used to control the polarization properties of the waveguide device. The use of the birefringence tensor of the HPDLC grating, K-vectors and grating footprints as design variables opens up the design space for optimizing the angular capability and optical efficiency of the waveguide device. In some embodiments, a quarter wave plate disposed on a glass-air interface of the waveguide rotates polarization of a light ray to maintain efficient coupling with the gratings. For example, in one embodiment, the quarter wave plate is a coating that is applied to substrate waveguide. In some waveguide display embodiments, applying a quarter wave coating to a substrate of the waveguide may help light rays retain alignment with the intended viewing axis by compensating for skew waves in the waveguide. In some embodiments, the quarter wave plate may be provided as multi-layer coating.
The construction and arrangement of the systems and methods as shown in the various exemplary embodiments are illustrative only. Although only a few embodiments have been described in detail in this disclosure, many modifications are possible (for example, variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.). For example, the position of elements may be reversed or otherwise varied and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of the present disclosure. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. Other substitutions, modifications, changes, and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present disclosure.
While the above description contains many specific embodiments of the invention, these should not be construed as limitations on the scope of the invention, but rather as an example of one embodiment thereof. It is therefore to be understood that the present invention may be practiced in ways other than specifically described, without departing from the scope and spirit of the present invention. Thus, embodiments of the present invention should be considered in all respects as illustrative and not restrictive. Accordingly, the scope of the invention should be determined not by the embodiments illustrated, but by the appended claims and their equivalents.
The current application is a continuation of U.S. patent application Ser. No. 16/895,856 entitled “Waveguides Incorporating Transmissive and Reflective Gratings and Related Methods of Manufacturing,” filed Jun. 8, 2020, which claims the benefit of and priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application No. 62/858,928 entitled “Single Grating Layer Color Holographic Waveguide Displays and Related Methods of Manufacturing,” filed Jun. 7, 2019, the disclosures of which are hereby incorporated by reference in their entireties.
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| Number | Date | Country | |
|---|---|---|---|
| 20220099898 A1 | Mar 2022 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62858928 | Jun 2019 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16895856 | Jun 2020 | US |
| Child | 17410828 | US |
