Interdigital Madison Patent Holdings, Sas

Polar Electro Oy

Interdigital Vc Holdings, Inc.

Jukka-Tapani Makinen

Kai Markus Ojala

Seppo Korkala

Mikko Repka

Juha Sumen

Markku Alamaki

Systems and methods are described for displaying a light field using a display device in which a plurality of internal light paths contribute to each respective output beam and in which each light path traverses at least one controllable-transparency pixel of the display. In example methods, a target light field is partitioned into a plurality of light field partitions that sum to the target light field. Each light field partition is associated with a subset of the internal light paths. Pixel values of the display device are selected to minimize a total error in each path's contribution to its corresponding light field partition. Methods described herein may be used to select pixel values in display devices that include a diffractive element, such as a diffraction grating.

Multi-frame decomposition method for image rendering on multilayer displays

Some embodiments of an example apparatus may include a display, a first controllable diffuser overlaying the display, the first controllable diffuser being selectively operable to diffuse light in a first diffusion direction, and a second controllable diffuser overlaying the display, the second controllable diffuser being selectively operable to diffuse light in a second diffusion direction substantially perpendicular to the first diffusion direction. In some embodiments, an example method may include emitting a light beam from a light emitting device; linearly polarizing the light beam; passing the light beam through LC and birefringent materials; and applying a voltage to alter polarization of the LC material, from a first state causing the light to diffuse in a first direction upon passing through the birefringent material, to a second state causing the light beam to diffuse in a second direction upon passing through the birefringent material.

Optical method and system for light field (LF) displays based on tunable liquid crystal (LC) diffusers

Embodiments include 3D display devices and methods of operation. In an example device, a light-emitting layer is provided with an addressable array of light-emitting elements. An optical layer overlays the light-emitting layer. The optical layer includes an array of lenses operative to substantially collimate light from the light-emitting layer. To suppress stay light, an angular filter layer is provided along an optical path from the light-emitting layer to an exterior of the display. The angular filter is operative to substantially block light having an incident angle greater than a threshold angle and to substantially transmit light having an incident angle less than a threshold angle. The angular filter may be a thin-film interference bandpass filter. Different regions of the angular filter may be tuned for different wavelengths of light.

Method for enhancing the image of autostereoscopic 3D displays based on angular filtering

Some embodiments of an apparatus may include: a tracking module configured to track viewer movement adjustments; and a light field image display structure configured to display a light field image using the viewer movement adjustments. Some embodiments of a method may include: projecting a beam spot on a viewer of a light field display; determining an estimated location of the beam spot reflected off the viewer; detecting an actual location of the beam spot reflected off the viewer; and determining image correction parameters based on a comparison of the estimated location and the actual location of the beam spot reflected off the viewer.

Method and system for continuous calibration of a 3D display based on beam steering

Some embodiments of an apparatus may include: a plurality of light sources, wherein each of the plurality of light sources is configured to emit a respective light beam; one or more diffractive layers; and an optical mask configured to be synchronized to an illumination of the respective light beams. Some embodiments of a method may include: emitting a light beam from each of a plurality of light emitting sources to generate a plurality of light beams; diffracting each of the plurality of light beams to generate a plurality of diffracted light beams; and synchronizing an optical mask to the plurality of diffracted light beams.

3D display directional backlight based on diffractive elements

Systems and methods are described for providing a 3D display, such as a light-field display. In some embodiments, a display device includes a light-emitting layer comprising an addressable array of light-emitting elements. An optical layer overlays the light-emitting layer. The optical layer includes a plurality of distributed lenses. In some embodiments, the distributed lenses include non-contiguous lens regions. In some embodiments, distributed lens regions with different optical centers are interlaced with one another. A spatial light modulator is operative to provide control over which lens regions transmit light from the light-emitting layer outside the display device. In some embodiments, the use of interlaced and/or non-contiguous distributed lenses provides improved display resolution with a reduction in diffraction effects.

Optical method and system for light field displays based on distributed apertures

Systems and methods are described for providing a 3D display, such as a light-field display. In some embodiments, a display device includes a light-emitting layer that includes a plurality of separately-controllable pixels. A lens structure overlays the light-emitting layer. The lens structure includes an array of collimating optical elements. A phase-modifying layer is positioned between the light emitting layer and the lens structure. The pixels of the light emitting layer are used in generating spatial emission patterns that work in unison with the phase-modifying layer in order to generate beams of light through the collimating optical elements with extended focus depths. Multiple beams are used to generate voxels at various distances from the display surface with the correct eye convergence for the viewer. Beams with extended focus depths may be used to generate the correct eye retinal focus cues.

Optical method and system for light field displays based on beams with extended depth of focus

A light-emitting layer of an apparatus includes an addressable array of light-emitting elements including a first light-emitting element and a periodic optical layer overlaying the light-emitting layer. The periodic optical layer includes at least a first periodic optical feature having a first optical power and a second periodic optical feature having a different optical power. A first controllable light-steering layer is disposed between the light-emitting layer and the periodic optical layer. The first controllable light-steering layer is switchable between directing light from the first light-emitting element through the first periodic optical feature and directing light from the first light-emitting element through the second periodic optical feature.

Optical method and system for light field displays having light-steering layers and periodic optical layer

Display methods and apparatus are described. In some embodiments, to generate an image, light is selectively emitted from one or more light-emitting elements (such as a &#x3bc;LEDs) in a light-emitting layer. The emitted light from each element is collimated using, for example, an array of microlenses having small apertures. Each beam of collimated light is split by a first diffractive grating into a first generation of child beams, and the first generation of child beams is split by a second diffractive grating into a second generation of child beams. Beams in the second generation of child beams that are not parallel to the original beam of collimated light may be blocked by a spatial light modulator (e.g. an LCD panel). The un-blocked beams operate in some respects as if they had been generated using optics with an aperture larger than the apertures of the microlenses.

Method and system for aperture expansion in light field displays

A method includes: obtaining, by an apparatus, instantaneous images from an optical heart activity sensor, wherein the instantaneous images characterize a heart activity data of a user; obtaining information about spatial shifts of a measuring area of the optical heart activity sensor in relation to a body tissue of the user; determining effect of the spatial shifts in the instantaneous images based on the information about the spatial shifts; enhancing the instantaneous images by decreasing the effect of the spatial shifts in the instantaneous images; and processing the enhanced instantaneous images into the heart activity data of the user.

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Oulu, Finland

Jukka-Tapani Makinen