A near-eye display device, including: a display screen (1) used for image display; an imaging lens (2) located at a light emission side of the display screen (1) and used for imaging a displayed image of the display screen (1); a flat plate (3) located on the side of the imaging lens (2) facing away from the display screen (1) and obliquely arranged relative to the optical axis of the imaging lens (2); a phase retardation layer (4) located on the side of the flat plate (3) facing the imaging lens (2); a polarization beam-splitting layer (5) located between the phase retardation layer (4) and the flat plate (3); a polarizing layer (6) located between the polarization splitting layer (5) and the flat plate (3); and a curved mirror (7).

The present invention relates to a reflective eyepiece optical system and a head-mounted near-to-eye display apparatus. The system includes: a first lens group, and a first optical element and a second lens group for transmitting and reflecting a light from a miniature image displayer. The second lens group includes an optical reflection surface, and the optical reflection surface is an optical surface farthest from a human eye viewing side in the second lens group. The optical reflection surface is concave to a human eye viewing direction. The first optical element reflects the light refracted by the first lens group to the second lens group, and then transmits the light refracted, reflected, and refracted by the second lens group to the human eye.

Metallic, electrically conductive, structures on smart glasses, which can be utilized to provide structural integrity and/or thermal dissipation capability, can be leveraged to provide antenna capability as well. Metallic structures on smart glasses are utilized as antenna grounds, with corresponding antenna elements being electrically coupled thereto, and located on the glasses temple. Such antenna elements implement folded antennas having an antenna length selected in accordance with desired communicational frequencies. A shorting pin establishes the electrical connection to the antenna ground. Metallic structures on smart glasses are also utilized as antenna elements, with different metallic structures acting as the antenna ground. Such antenna elements implement monopole antennas having a length selected in accordance with desired communicational frequencies, and a width that can maintain structural integrity and/or thermal dissipation capability. Multiple antenna elements are manufactured onto a single glasses temple, and both temples of the smart glasses comprise antennas.

The disclosed ultrasound devices may include at least one ultrasound transmitter positioned and configured to transmit ultrasound signals toward a user's face to reflect off a facial feature of the user's face and at least one ultrasound receiver positioned and configured to receive and detect the ultrasound signals reflected off the facial feature. At least one processor may be configured to receive data from the at least one ultrasound receiver and to determine, based on the received data from the at least one ultrasound receiver, at least one of the following eye measurements: an interpupillary distance of the user; an eye relief; or a position of a head-mounted display relative to the facial feature of the user. Various other devices, systems, and methods are also disclosed.

A light guide includes: a light guide board configured to allow light incident on an optical entrance to propagate through the light guide board, the light guide board including: the optical entrance; a first face; and at least one partial reflection layer within the light guide board and tilted to the first face. The at least one partial reflection layer is configured to reflect a part of light incident on the at least one partial reflection layer at an incident angle of greater than or equal to a critical angle θ.sub.r to allow the reflected light to exit the light guide board through the first surface while transmitting therethrough a remainder of the light incident on the at least one partial reflection layer. Formula below is satisfied: θ.sub.r=sin.sup.−1(n.sub.2/n.sub.1) where θ.sub.r is the critical angle; n.sub.1 is a refractive index of the light guide board; and n.sub.2 is a refractive index of the at least one partial reflection layer.

A waveguide combiner includes an in-coupling area, a waveguide body, an out-coupling area and at least one film layer. The in-coupling area is configured to introduce a light beam. The waveguide body is configured to guide the light beam introduced by the in-coupling area. The out-coupling area is configured to output the light beam guided by the waveguide body. Said at least one film layer is embedded in at least one portion of the in-coupling area, the waveguide body and the out-coupling area. Said at least one film layer is configured to divide said at least one portion of the in-coupling area, the waveguide body and the out-coupling area into a plurality of layers, and the light beam is reflected by said at least one film layer or penetrates said at least one film layer between different layers of the plurality of layers.

In one aspect, a headset may include a bridge with lenses, an elongated left temple coupled to a left portion of the bridge, and an elongated right temple coupled to a right portion of the bridge. The headset may also include at least one adjustable mechanism that is manipulable to dynamically arrange the structure of the temples toward and away from the bridge, as well as a locking mechanism that selectively locks and unlocks the arrangement of the temples with respect to the bridge. In some examples, the adjustable mechanism may include at least one track for sliding the left and right temples with respect to the bridge to extend and retract distal portions of the temples from the bridge, and at least one element such as a wheel that is controllable to move the temples with respect to the bridge along the at least one track.

A method, performed by an augmented reality (AR) device including a vision correction lens, of detecting a gaze of a user is provided. The method includes obtaining lens characteristic information about the vision correction lens arranged to overlap a light guide plate in a gaze direction of the user, emitting light for gaze tracking toward a light reflector through a light emitter, wherein the emitted light is reflected by the light reflector and then directed to an eye of the user, receiving a light reflected by the eye of the user through a light receiver, obtaining an eye image of the user based on the light received, adjusting the eye image of the user based on the lens characteristic information about the vision correction lens, and obtaining gaze information based on the adjusted eye image.

A nanocomposite includes a plurality of nanoparticles, where each nanoparticle of the plurality of nanoparticles includes a TiO.sub.2 nanoparticle core characterized by a diameter between about 1 nm and about 20 nm and a surface .OH density below about 6.OH/nm.sup.2, and a nanoparticle shell conformally formed on surfaces of the TiO.sub.2 nanoparticle core. The nanoparticle shell is continuous and is thinner than about 2 nm. The nanoparticle shell includes a transparent material with a refractive index greater than about 1.7 for visible light. A valence band of the nanoparticle shell is more than about 0.1 eV lower than a valence band of the TiO.sub.2 nanoparticle core. A conduction band of the nanoparticle shell is more than about 0.5 eV higher than a conduction band of the TiO.sub.2 nanoparticle core.

A display device includes a light source, a spatial light modulator, and an optical element. The optical element includes a reflective surface. The optical assembly is positioned relative to the light source so that at least a portion of the illumination light received by the optical element is reflected at the reflective surface back toward the light source. The spatial light modulator is positioned to receive at least a portion of the illumination light reflected by the reflective surface. A method performed by the display device is also disclosed.