Abstract: A system includes a plurality of first LEDs, a plurality of second LEDs, a first controllable current source that is configured to generate a first bias current for driving a first one of the plurality of first LEDs and a plurality of first ones of the plurality of second LEDs, a first measurement circuit that is configured to measure a first current-voltage (I-V) performance characteristic of the first one of the plurality of first LEDs, and a lens that is arranged to receive light from the plurality of second LEDs. A property of the first bias current is determined as a function of at least two measurements of the first I-V performance characteristic that are acquired while the first bias current is applied to the first one of the plurality of first LEDs and the plurality of first ones of the plurality of second LEDs.

Abstract: Techniques for fabricating a slanted structure are disclosed. In one embodiment, a method for fabricating a slanted structure on a material layer includes forming a mask layer on the material layer, and implanting ions into a plurality of regions of the material layer at a slant angle greater than zero using an ion beam and the mask layer. The slant angle is measured with respect to a surface normal of the material layer. Implanting the ions into the plurality of regions of the material layer changes a refractive index or an etch rate of the plurality of regions of the material layer. In some embodiments, the method further includes wet-etching the material layer using an etchant to remove materials in the plurality of regions of the material layer. In some embodiments, the method includes either simultaneous or post-implantation etching of modified material through a dry etching process using reactive etchants in feed gas.

Abstract: Techniques disclosed herein relate generally to surface-relief structures. In one embodiment, a surface-relief grating includes a plurality of grating ridges. The plurality of grating ridges includes a first set of grating ridges characterized by a first refractive index, and a second set of grating ridges interleaved with the first set of grating ridges and characterized by a second refractive index different from the first refractive index. The plurality of grating ridges is imprinted in a polymer layer by a nanoimprint lithography process and is exposed to a light pattern to form the first set of grating ridges and the second set of grating ridges that have different refractive indices.

Abstract: A tunable liquid crystal (LC) device includes an LC layer between a pair of reflectors forming an optical cavity. The reflectors include conductive layers for applying an electrical signal to the LC layer. One of the conductive layers may include an array of conductive pixels for spatially selective control of the effective refractive index of the LC layer. The phase delay introduced by the LC layer may be greatly increased or magnified by placing the LC layer into the optical cavity. This enables a substantial reduction of the LC layer thickness, which in its turn enables very tight pitches of the LC pixels, with a reduced inter-pixel crosstalk caused by fringing electric fields, as well as faster switching times. A tight-pitch, fast LC device may be used as a configurable hologram or a spatial light modulator.

Abstract: In one embodiment, a computer implemented method for rendering virtual environments is disclosed. The method includes associating by a computing system, virtual object with a container effect, by receiving information regarding an object category for the object and matching the object category to a category associated with the container effect, where the container effect defines virtual effects for objects associated therewith. The method also includes generating by the computing system a virtual environment including the virtual object by retrieving a model of the object and utilizing the model and the container effect to render a virtual object.

Abstract: Optical hyperfocal reflective systems and methods are provided. One such optical hyperfocal reflective system has an optical substrate; an optical input coupling portion configured to input couple a collimated display image to the optical substrate; and an optical hyperfocal output coupling portion integrated with said optical substrate. The optical output coupling portion includes at least one hyperfocal reflective view port formed from a discrete optical hyperfocal reflector spot integrated with the optical substrate. The discrete optical hyperfocal reflector spot is sized to form a reflected discrete optical spot beam with a diameter at a target area such that a view of a discrete virtual display image portion, as seen by a lens-detector system locatable at the target area, is hyperfocused.

Abstract: A head-mounted display device for providing augmented reality contents to a wearer includes an eye tracker, a light projector, a beam steerer and a combiner. The eye tracker is configured to determine a position of a pupil of an eye of the wearer. The light projector is configured to project light for rendering images. The beam steerer is configured to change a direction of the light from the light projector based on the position of the pupil. The combiner is configured to combine the light from the light projector and light from an outside of the head-mounted display device for providing an overlap of the rendered image and a real image that corresponds to the light from the outside of the head-mounted display device.

Abstract: An imaging waveguide for a visual display includes a substrate for guiding image light therein by total internal reflection (TIR). An input grating is supported by the substrate for coupling the image light into the imaging waveguide. An output grating is supported by the substrate and spaced apart from the input grating for coupling the image light guided in the substrate out of the imaging waveguide for observation by a user. A gap filling overcoat is formed on and within the output grating, but not on or within the input grating. The material is characterized by a refractive index between 1.40 and 1.80 at 500 nm, absorption between 0% and 1% in the visible region of the electromagnetic spectrum, and % haze between 0% and 0.2% in the visible region of the electromagnetic spectrum.

Abstract: Described are light emitting apparatus with self-aligned elements and techniques for manufacturing such light emitting apparatus. In certain embodiments, a light emitting apparatus includes a mesa formed by a plurality of semiconductor layers. The light emitting apparatus further includes an electrical contact on one of the semiconductor layers and a spacer around the electrical contact. The spacer is aligned with respect to the electrical contact, which permits etching around the spacer to define the shape of the mesa in such a way that the mesa is also aligned with respect to the electrical contact. In particular, the electrical contact is substantially centered between opposing sidewalls of the mesa.

Abstract: A pupil replication waveguide for a projector display includes a slab of transparent material for propagating display light in the slab via total internal reflection. A diffraction grating is supported by the slab. The diffraction grating includes a plurality of tapered slanted fringes in a substrate for out-coupling the display light from the slab by diffraction into a blazed diffraction order. A greater portion of the display light is out-coupled into the blazed diffraction order, and a smaller portion of the display light is out-coupled into a non-blazed diffraction order. The tapered fringes result in the duty cycle of the diffraction grating varying along the thickness direction of the diffraction grating, to facilitate suppressing the portion of the display light out-coupled into the non-blazed diffraction order.

Abstract: A micro-LED includes a light emitting device that emits a light beam surface—normally and a plurality of semiconductor layers that modify the light beam. Each semiconductor layer includes a first lateral region and a second lateral region, where the first lateral region and the second lateral region are characterized by different respective refractive indices. The first lateral regions of the plurality of semiconductor layers are arranged in two or more different lateral areas of the semiconductor light source. The second lateral region in each semiconductor layer of the plurality of semiconductor layers includes a semiconductor material with a different respective composition. The plurality of semiconductor layers form a planar optical component that is used to, for example, collimate, converge, diverge, or deflect the light beam emitted by the light emitting device.

Abstract: A structured film for use with a display comprises an optically transmissive surface including a plurality of walls. When the film is placed in an operative position with respect to the display, the walls extend away from the display at different heights and surround light emitters of the display. The film operates as a diffraction grating and the walls are configured to generate selected diffraction orders for each light emitter, including generating a diffraction order for a first light emitter and a diffraction order for a second light emitter adjacent to the first light emitter such that a predefined portion of light energy radiated by the first light emitter is permitted to spread toward the second light emitter. The film minimizes the screen-door effect and can be used in combination with local contrast control over a region of interest.

Abstract: A system and method for detecting a pose of an object is described. An augmented reality display device accesses first sensor data from an image sensor and a depth sensor of the augmented reality display device. The first sensor data includes a first plurality of images of an object and corresponding depth data relative to the augmented reality display device and the object. The augmented reality display device detects first features corresponding to the object by applying a convolutional neural network to the first sensor data, forms a plurality of training clusters based on the first features, and stores the plurality of training clusters in a training database.

Abstract: A virtual-reality device displays a virtual scene. The device generates audio data for an area source in the virtual scene. The area source is within a predefined near-field distance from the listener. The device selects sample points from the area source and determines, for each sample, energy contributions to two respective successive shells of spherical shells that extend from the listener to the predefined near-field distance. The two shells enclose the sample point source, and the determined energy contributions correspond to sound originating from the sample point source. For each shell, the device determines a head-related impulse response (HRIR) by combining the determined energy contributions for that shell. The device determines an overall HRIR for the virtual scene by combining the determined HRIRs for the shells and combines the audio data with the overall HRIR. The device transmits the combined audio data to sound-producing elements of the device.

Abstract: Systems and methods for generating composite depth images are disclosed. Exemplary implementations may: capture, by a depth sensor, a set of depth images over a capture period of time; generate, by an inertial sensor, inertial signals that convey values of one or more inertial parameters characterizing motion of the depth sensor during the capture period of time; select a target capture position based on one or more of the capture positions of the set of depth images; generate, using the values of the one or more inertial parameters during the capture period of time, re-projected depth images; and generate a composite depth image by combining multiple depth images, such multiple depth images including a first re-projected depth image and a second re-projected depth image.

Abstract: A display device includes a frame, a display, an optical assembly, and a display-moving assembly connected to the display and the frame. The display-moving assembly is configured to move the display between multiple different positions, including a first position and a second position. When the display is in the first position, the display is configured to output image light in a first direction. The first direction is substantially parallel to an optical axis of the optical assembly. When the display is in the second position, the display is positioned away from the optical axis of the optical assembly.

Abstract: Disclosed herein are techniques for imaging in eye tracking. An imaging system for eye tracking includes a camera configured to detect light in a first wavelength range, a substrate configured to be placed in front of an eye of a user, and at least one reflector located within the substrate. The at least one reflector is configured to receive light in the first wavelength range reflected by the eye of the user, reflect at least a portion of the received light in the first wavelength range to the camera, and transmit light in a second wavelength range different from the first wavelength range to the eye of the user. The substrate is transparent to both the light in the first wavelength range and the light in the second wavelength range.

Abstract: A waveguide display includes a substrate transparent to visible light, a coupler configured to couple display light into the substrate such that the display light propagates within the substrate through total internal reflection, a first multiplexed volume Bragg grating (VBG) on the substrate, and a second multiplexed VBG on the substrate. The second multiplexed VBG overlaps with the first multiplexed VBG in at least a see-through region of the waveguide display. The first multiplexed VBG is configured to diffract the display light to two or more regions of the second multiplexed VBG, and the second multiplexed VBG is configured to diffract the display light to two or more regions of an eyebox of the waveguide display.

Abstract: An apparatus for creating haptic stimulations is provided. The apparatus includes one or more pods coupled to a garment, each pod including: (i) an internal structure, and (ii) an airtight bladder surrounding the internal structure, where the bladder is pneumatically coupled to a pneumatic device that is configured to control a pressurized state of the bladder. Each pod is configured to: (i) have a first degree of flexibility when the bladder of the pod is in a first pressurized state; and (ii) have a second degree of flexibility, less than the first degree of flexibility, when the bladder of the pod is in a second pressurized state different from the first pressurized state. Each pod provides a haptic stimulation to a wearer of the garment when the corresponding bladder is in the second pressurized state.

Abstract: Techniques disclosed herein relate to a near-eye display system. One example of an optical device of a near-eye display includes a substrate and holographic grating conformally coupled to a surface of the substrate. The substrate is transparent to visible light and infrared light and is configured to be placed in front of an eye of a user of the near-eye display. A refractive index modulation of the holographic grating is apodized in a surface-normal direction of the substrate to reduce optical artifacts in the visible light.