Abstract: Provided is an augmented reality (AR) device based on a waveguide with a holographic diffractive grating structure and an apparatus for recording the holographic diffractive grating structure. The apparatus includes a light source, a beam splitter, a first amplitude filter and a first triangular prism that are arranged on a path of a first light beam, and a second amplitude filter and a second triangular prism that are arranged on a path of a second light beam, in which a first part of the first light beam passes through the first triangular prism without attenuation, a second part of the first light beam passes through the first triangular prism after being attenuated, and the second light beam passes through the second triangular prism after being attenuated, and the holographic diffractive grating structure is recorded between the first triangular prism and the second triangular prism.

Abstract: The disclosure relates to augmented reality devices, namely to near-field displays, to planar waveguides with diffractive optical elements and displays based on such planar waveguides. The architecture of diffractive optical elements, performed in a waveguide and a method for operating the architecture of diffractive optical elements, eliminating image dispersion and expanding the horizontal field of view are provided. The method for operating the architecture of diffractive optical elements, expanding the vertical field of view and a device for displaying an augmented reality containing the proposed architecture of diffractive optical elements are provided. The augmented reality glasses includes the proposed augmented reality display device.

Abstract: An eye-tracking electronic device is provided. The eye-tracking electronic device includes a scanner, at least two photodetectors configured to generate electric pulses when a scanning line reflected from a cornea is incident thereon, and at least one processor configured to generate at least one scanning line through the scanner, radiate the at least one scanning line to the cornea, and determine a direction of gaze based on time information when the at least two photodetectors generate the electrical pulses.

Abstract: A holographic display and a method, performed by the holographic display, of forming a holographic image are disclosed. The holographic display includes an electrically addressable spatial light modulator (EASLM); a diffractive optical element (DOE) mask array arranged on the EASLM; and a controller configured to operate the holographic display to form a hologram image, wherein the controller is further configured to address the EASLM to backlight the DOE mask array required to form a set of hologram image voxels by turning on a corresponding EASLM pixel.

Abstract: The disclosure relates to augmented reality devices, and more particularly, to augmented reality glasses and methods for operating the same. An augmented reality display device is provided. The augmented reality display device includes a projection system, an optical compensator positioned after the projection system, and a flexible waveguide. The flexible waveguide can change its curvature and comprises an input diffraction grating and an output diffraction grating. The optical compensator is configured to introduce pre-distortion to the image and optically zoom the image received from the projection system, the pre-distortion in the image and optical zoom of the image being opposite to those introduced by the flexible waveguide to the undistorted image in accordance with chosen radius of the flexible waveguide. Flexible diffraction grating distorts the pre-distorted image. The output diffraction grating outputs undistorted image to a user's eyes.

Abstract: The disclosure relates to augmented reality devices and methods for operating such devices. A waveguide with a diffractive optical elements-based architecture for an augmented reality device is provided. The waveguide includes a light in-coupling zone, a light expanding zone, and a light out-coupling zone. Each zone includes its own set of diffractive optical elements performing the light in-couple, light expand and light out-couple function. There are further provided an augmented reality display device and augmented reality glasses based on the waveguide with the diffractive optical elements-based architecture.

Abstract: A method and systems for simultaneous recording of superimposed holographic gratings for augmented reality devices are provided.

Abstract: A user identification device according to a disclosed embodiment includes a transmitter for scattering radio-frequency (RF) signals into tissues of a body part of a user, a receiver for receiving the RF signals having passed through the tissues of the body part of the user, a memory for storing parameters of a trained classification algorithm, and a processor for identifying the user by analyzing the received RF signals based on the trained classification algorithm by using the parameters of the trained classification algorithm in response to receiving the RF signals through the receiver.

Abstract: An optical lens having a tunable focal length and a display device including the same are provided. The optical lens includes a control electrode including a plurality of electrode elements, an electroactive material layer provided on the control electrode, and a common electrode spaced apart from the control electrode. The electroactive material layer is interposed between the common electrode and the control electrode. The optical lens includes a plurality of bus sets, each bus set of the plurality of bus sets including a plurality of buses, wherein the plurality of bus sets include a first bus set and a second bus set, the first bus set is configured to apply a first voltage to the plurality of electrode elements to generate a first phase profile of light, and the second bus set is configured to apply a second voltage to the plurality of electrode elements to generate a second phase profile of light.

Abstract: A mid-air image display device and an operation method thereof are provided. The mid-air image display device includes: a projection system configured to generate a light beam for an image; at least one positive lens; and a light multiplication module comprising a first transmission grating, a second transmission grating, a waveguide and a reflection grating, and configured to receive the light beam from the projection system and transmit the received light beam through the first transmission grating, the second transmission grating, the waveguide and the reflection grating, wherein the at least one positive lens is disposed on the light multiplication module, and configured to receive the light beam transmitted through the light multiplication module to form a mid-air image.

Abstract: According to an embodiment of the disclosure, there is provided an electronic device including: an optical element that is fixed and is configured to split incident light reflected from an object into two or more incident light beams traveling along two or more light paths; an optical sensor that is spaced a separation distance from the optical element such that the split incident light beams form an interference area on a light receiving surface and is configured to detect the incident light; and at least one processor configured to determine state information about the object based on similarity between a first spectrum acquired from the detected incident light and at least one reference spectrum.

Abstract: Provided is a waveguide guiding light to a target area, the waveguide including an input-coupling diffractive optical element (DOE) inputting the light into the waveguide, an expanding DOE expanding the light input into the waveguide through the input-coupling DOE, an output-coupling DOE outputting the light expanded in the waveguide by the expanding DOE to an outside of the waveguide, wherein the expanding DOE includes a plurality of expanding segments, and the output-coupling DOE includes a plurality of output-coupling segments.

Abstract: A method of eye tracking includes: irradiating a light pattern, output from at least one collimated light source, to a cornea surface; detecting at least a part of the light pattern reflected from the cornea surface, the at least the part of the light pattern being guided by a sensor waveguide; obtaining a mapping image corresponding to the at least the part of the light pattern; and determining a direction of a gaze based on the obtained mapping image. The sensor waveguide used to determine the direction of the gaze is different from a waveguide for displaying output information.

Abstract: Provided is a holographic waveguide including a waveguide element configured to guide light, and a diffractive optical element including an aberration correction hologram pattern, the diffractive optical element being provided adjacent to the waveguide element and configured to correct aberrations generated in the light traveling along the waveguide element by the waveguide element.

Abstract: Provided is an augmented reality (AR) device based on a waveguide with a holographic diffractive grating structure and an apparatus for recording the holographic diffractive grating structure. The apparatus includes a light source, a beam splitter, a first amplitude filter and a first triangular prism that are arranged on a path of a first light beam, and a second amplitude filter and a second triangular prism that are arranged on a path of a second light beam, in which a first part of the first light beam passes through the first triangular prism without attenuation, a second part of the first light beam passes through the first triangular prism after being attenuated, and the second light beam passes through the second triangular prism after being attenuated, and the holographic diffractive grating structure is recorded between the first triangular prism and the second triangular prism.

Abstract: An optical lens having a tunable focal length and a display device including the same are provided. The optical lens includes a control electrode including a plurality of electrode elements, an electroactive material layer provided on the control electrode, and a common electrode spaced apart from the control electrode. The electroactive material layer is interposed between the common electrode and the control electrode. The optical lens includes a plurality of bus sets, each bus set of the plurality of bus sets including a plurality of buses, wherein the plurality of bus sets include a first bus set and a second bus set, the first bus set is configured to apply a first voltage to the plurality of electrode elements to generate a first phase profile of light, and the second bus set is configured to apply a second voltage to the plurality of electrode elements to generate a second phase profile of light.

Abstract: Provided are an apparatus for displaying a holographic image and a method of controlling the apparatus. The apparatus for displaying the holographic image includes a controller, a light source, an optical system, a spatial light modulator, a filter, an electric optical scanner, a multi-channel projection optics, and a screen. The spatial light modulator modulates a light beam passing through the optical system according to a predetermined subframe sequence of holographic image frames, the filter performs spatial-angular filtering of the modulated light beam to exclude parasitic diffraction order components from the modulated light beam, and the electric optical scanner directs the modulated and filtered light beam towards a corresponding channel of the multi-channel projection optics and forms a plurality of viewing zones on a focal plane of a field lens provided in the screen.

Abstract: An eye-tracking electronic device is provided. The eye-tracking electronic device includes a scanner, at least two photodetectors configured to generate electric pulses when a scanning line reflected from a cornea is incident thereon, and at least one processor configured to generate at least one scanning line through the scanner, radiate the at least one scanning line to the cornea, and determine a direction of gaze based on time information when the at least two photodetectors generate the electrical pulses.

Abstract: According to an embodiment of the disclosure, there is provided an electronic device including: an optical element that is fixed and is configured to split incident light reflected from an object into two or more incident light beams traveling along two or more light paths; an optical sensor that is spaced a separation distance from the optical element such that the split incident light beams form an interference area on a light receiving surface and is configured to detect the incident light; and at least one processor configured to determine state information about the object based on similarity between a first spectrum acquired from the detected incident light and at least one reference spectrum.

Abstract: A holographic display and a method, performed by the holographic display, of forming a holographic image are disclosed. The holographic display includes an electrically addressable spatial light modulator (EASLM); a diffractive optical element (DOE) mask array arranged on the EASLM; and a controller configured to operate the holographic display to form a hologram image, wherein the controller is further configured to address the EASLM to backlight the DOE mask array required to form a set of hologram image voxels by turning on a corresponding EASLM pixel.