Abstract: An apparatus, comprising, a scan module having one or more laser sources that generate one or more initial laser beams and two or more beam deflectors that deflect the one or more initial laser beams. A beam optic is configured to substantially collimate the one or more initial laser beams to produce one or more collimated laser beams. One or more beam deflector controllers are configured to control an angle of beam deflection from each beam deflector. Relay optics between the two or more beam deflectors are configured to image each sequential beam deflector in an optical chain onto the subsequent beam deflector in such a manner that the beam deflecting from a last beam deflector in the optical chain contains a combination or superposition of all the beam deflections of the beam deflectors in the sequence, and maintains a beam divergence of the one or more collimated beams.

Abstract: The disclosure provides a camera module, a monitoring system and a vehicle camera, the camera module includes a lens barrel, a first lens and a heating element, the lens barrel includes a light entrance, the first lens is disposed at the light entrance, the first lens includes an image side surface, the heating element directly acts on the image side surface to heat the first lens. By directly applying the heating element to the image side surface of the first lens, the heating element can directly transmit heat energy to the first lens, thereby achieving the effect of defogging and defrosting automatically.

Abstract: An imaging device includes an imaging unit, a lens unit including a plurality of lenses stacked on each other to guide light to the imaging unit, a heater member used for a heater configured to heat a top lens closest to an object among the lenses included in the lens unit, and a reflection suppressor disposed between a region outside of an effective region of the top lens and the heater member, the reflection suppressor being configured to suppress light reflection. The reflection suppressor includes a first reflection suppressor disposed on the top lens side and having an uneven surface, and a second reflection suppressor disposed on the heater member side, the first reflection suppressor being layered on the second reflection suppressor. A surface of the second reflection suppressor facing the heater member is smoother than a surface of the second reflection suppressor facing the first reflection suppressor.

Abstract: A lens assembly for a weapon sight includes a first lens having an optical axis and a focal plane array (FPA) coaxial with the optical axis of the first lens. A first parameter of the first lens is selected that minimizes an error in image shift when the weapon sight lens assembly is adjusted for focus. The first parameter of the first lens can be at least one of a lateral position, axial displacement, thickness, effective focal length, material, effective focal length, radius of curvature, conic constants, and higher order aspheric coefficients of the first lens. A sensor can detect a position of the lens and a processor can compare the measured position to an ideal position and use a lookup table to display a corrected reticle position or corrected scene. An actuator may move the lens to the ideal position from the measured position.

Abstract: A head up display arrangement for a motor vehicle includes an image source emitting a light field. A first freeform mirror is positioned to provide a first reflection of the light field. A generally concave second freeform mirror is positioned to receive the first reflection and provide a second reflection of the light field. The second reflection is reflected off of a windshield of the vehicle so as to be visible to a driver of the vehicle as a virtual image. The generally concave second freeform mirror includes a reflective surface having a shape such that the virtual image appears to be curved to the driver of the vehicle.

Abstract: The present application discloses a system and device for displaying content. The system includes two optical units. The two optical units are part of the system that is wearable. Each of the two optical units comprises a front lit display. The system includes an adjustable mounting. The adjustable mounting enables a user to adjust a mounting position of the two optical units.

Abstract: A control method for an immersive system includes following steps. A communication is established between a mobile device and a head-mounted display device. Pose data of the mobile device is captured. A touch event is detected by a touch screen on the mobile device. An interface layout is defined on the touch screen, and the interface layout includes a plurality of functional regions. A target function is selected from candidate functions by mapping a position of the touch event with one of the functional regions in the interface layout. The target function is executed and an immersive content displayed by the head-mounted display device is rendered according to the target function and the pose data.

Abstract: Systems and methods disclosed provided a virtual reality experience, including: a set of motorized pads for coupling to feet of a user; a means of communication between the set of motorized pads and a computing environment operating a virtual reality headset; such that the set of motorized pads are configured to provide pressure on a user's feet as an avatar within a virtual environment traverses the environment. Systems and methods disclosed further provide a multiuser virtual reality experience. Systems and methods disclosed further provide a multiuser experience including generation of a common environment viewable in the virtual reality headsets; and recording a tour including audio data as the first user describes the common environment.

Abstract: A virtual image display device includes: an image light generating device; a projection optical system configured to project image light emitted from the image light generating device; a folding mirror configured to reflect, in an intersecting direction, the image light from the projection optical system; a semi-transmissive mirror configured to reflect a portion of the image light from the folding mirror; and a concave surface mirror configured to reflect, toward the semi-transmissive mirror, the image light reflected at the semi-transmissive mirror to form an exit pupil, in which an optical axis of the image light extending from the image light generating device to the folding mirror is disposed between a first virtual extension plane obtained by imaginarily extending the semi-transmissive mirror and a second virtual extension plane obtained by imaginarily extending the concave surface mirror.

Abstract: An optical system for a see-through display includes a stack of metasurface layers configured to receive light constituting an image; and a waveguide coupled to the stack. Each layer in the stack of metasurface layers is configured to provide a resonant response to an optical field at a different spectral band and to couple the resonant response with a waveguide. The waveguide is configured to propagate the different spectral bands in a direction of a user's eye.

Abstract: A head-mounted display (HMD) device is provided. The HMD device includes a transparent member, a display, at least one sensor, and at least one processor functionally connected to the display and the at least one sensor. The at least one processor is configured to obtain information on a surrounding environment of the HMD device via the at least one sensor, set a focus space generated based on a designated location, determine at least one first object positioned inside the focus space and at least one second object positioned outside the focus space, based on the information on the surrounding environment and the focus space, and display, via the display, a virtual image in an area of the transparent member, wherein the at least one second object is seen in the area.

Abstract: An electronic device may have a display panel with an array of display pixels. Light from the display panel may be focused by a lens assembly towards a viewer. The presence of the lens assembly may cause geometric distortion for a viewer viewing images on the display through the lens assembly. To mitigate geometric distortion, geometric distortion compensation may be performed in the electronic device. The electronic device may include both a fixed lens element and a removable lens element in the lens assembly. The removable lens element may be changed, allowing the distortion function associated with the lens assembly to change over time. To dynamically compensate for geometric distortion caused by a lens assembly with a removable lens, ray tracing may be used to determine the geometric distortion caused by the lens assembly depending upon the particular removable lens that is present in the lens assembly.

Abstract: A display system includes a wearable eyewear arrangement with a projector for propagating display light associated with an image and a waveguide for propagating the display light to an eye box. The waveguide includes volume Bragg gratings (VBGs), which may be in groups of three or more gratings with same horizontal period allowing each color to be coupled out from the waveguide by the same type of grating, thus, at the same angle, reducing or eliminating image blurriness and ghost images while allowing a smaller size waveguide. A 100% reflective mirror or mirror array is used for broad spectrum reflection into the waveguide for light input. Selection of two or more wavelengths for each color at the projector provides spectral response matching to the waveguide allowing wider field of view (FOV) coverage for the entire wavelength spectrum.

Abstract: An exit pupil expander (EPE) has entrance and exit pupils, a back surface adjacent to the entrance pupil, and an opposed front surface. In one embodiment the EPE is geometrically configured such that light defining a center wavelength that enters at the entrance pupil perpendicular to the back surface experiences angularly varying total internal reflection between the front and back surfaces such that the light exiting the optical channel perpendicular to the exit pupil is at a wavelength shifted from the center wavelength. In another embodiment a first distance at the entrance pupil between the front and back surfaces is different from a second distance at the exit pupil between the front and back surfaces. The EPE may be deployed in a head-wearable imaging device (e.g., virtual or augmented reality) where the entrance pupil in-couples light from a micro display and the exit pupil out-couples light from the EPE.

Abstract: An article includes a hollow enclosure defining a void. The void has a first section and a second section separate from the first section. An electronic component is housed in the first section and the second section of the void. A low pressure mold material is molded into the first section of the void and cured around a first segment of the electronic component to encapsulate the first segment of the electronic component. A support seal is inserted into the second section of the void adjacent a second segment of the electronic component. The support seal defines a sealing barrier on one side of the low pressure mold material that limits the flow of low pressure mold material out of the first section of the void.

Abstract: A head-mounted device may have a head-mounted housing. The head-mounted housing may have rear-facing display that displays a three-dimensional image to rear eye boxes. The head-mounted device may also have a front-facing display that faces away from the rear eye boxes. The front-facing display may cover a front face of the head-mounted housing. To share content such as content being displayed by the rear-facing displays with external viewers, the head-mounted device may use the front-facing display or a separate display to display images. An accessory that is coupled to the front face of the housing may reflect an image on the front-facing display towards a viewer for viewing. Sensors in the device may detect presence of the accessory. Display projectors and waveguides or optical layers on the front face that overlap the front-facing display may be used to display three-dimensional images to front eye boxes.

Abstract: A display system comprising a steerable display having a monocular field of view of at least 1 degree, positioned within a scannable field of view of at least 20 degrees, the steerable display positioned for a user. In one embodiment, the steerable display is positioned for the user's fovea.

Abstract: Described herein are examples of a headset for mobile devices comprising a visor frame with a housing, a display screen, a mobile device connector, and a mobile device wherein the housing secures the mobile device adjacent to the display screen. The headset further includes a rear assembly with a microcontroller and a microcontroller connector. The display screen is configured to reflect an image from the screen of the mobile device, and the headset additionally includes lighting devices, and an application configured to receive input signals and send output commands to the headset to provide safety features for the headset for mobile devices.

Abstract: Disclosed is a head mounted display device. The head mounted display device includes a head mount unit wearable on a head of a user, a display unit supported on the head mount unit and sending an image to eyes of the user, and a position adjustment unit coupled to the head mount unit, connected to the display unit, and moving the display unit relative to the head mount unit such that a position of the display unit varies with respect to the eyes of the user.

Abstract: Optical systems for performing gaze tracking and imaging an external scene are disclosed. An example optical system may include light sources for emitting visible and non-visible light. The optical system may include a waveguide that is operatively coupled to the light sources. A volume holographic light coupling element may be disposed between the surfaces of the waveguide. The volume holographic light coupling element may include a grating medium and a first volume holographic grating structure within the grating medium. In some examples, the first volume holographic grating structure may be configured to reflect non-visible light of a first wavelength about a first reflective axis offset from a surface normal of the grating medium at a first incidence angle. The optical system may also include an optical filter. Another example optical system may include an imaging device that is configured to receive the light external to the optical system.

Abstract: An apparatus, system, and method for an imaging system that may be used to support eye tracking in a head mounted display. The imaging system may include an image sensor positioned in a user's field of view and within a lens assembly to capture light that is reflected from an eye. The imaging system may include two optical elements that are configured to at least partially direct scene light around the image sensor to conceal the image sensor from the user's eye. The image sensor is positioned between the two optical elements within the lens assembly.

Abstract: A system, method, and device for configuring an optical aiming device for ballistic drop compensation (BDC). The optical aiming device can include a housing with a reticle pane defining a reticle display field viewable by a user and indicating a zero point, the housing further including a plurality of axially spaced lenses and defining an optical path therethrough. In various embodiments the system includes a display device configured to project an image generated from a display, a processor, and a non-transitory computer readable storage medium. The computer readable data storage medium can include instructions executable by the processor to receive a first set of ballistics input data indicating a first type of ammunition, determine a BDC pattern including at least two holdover marks corresponding to at least two ranges for the first type of ammunition, and project the BDC pattern onto the reticle display field.

Abstract: A display system including an imager for forming an image, and a projection lens system for projecting the image formed by the imager is described. For each pixel in the plurality of pixels, the imager is configured to emit a cone of light having a central ray having a direction that varies with location of the pixel in the imager. The variation may increase a brightness of an image projected through the projection lens system by at least 30 percent. The display system may include a light guide having a light insertion portion adapted to receive light; a light transport portion disposed to receive light from the light insertion portion; and a light extraction portion disposed to receive light from the light transport portion.

Abstract: Disclosed herein are systems and methods including polarization sorting metasurface microlens array devices. In certain embodiments, a polarization imaging device is provided. The polarization imaging device includes: a source of image light; a metasurface lenslet array comprising a plurality of repeating metasurface lenslets, where the plurality of repeating metasurface lenslets comprise a plurality of first metasurface lenslets configured to diffract the image light into a first polarization light in a first direction and a second polarization light in a second direction; an image sensor positioned in the optical path of the first polarization light and the second polarization light, and where the image sensor includes a plurality of image sensing units including a first image sensing unit positioned to sense the first polarization light and a second image sensing unit positioned to sense the second polarization light.

Abstract: A tunable filter includes: an optical input/output unit; a first mirror having a first reflective surface disposed to reflect input light from the optical input/output unit; a transmissive diffraction grating disposed on a propagation path of the input light reflected by the first mirror; and a second mirror having a second reflective surface disposed to reflect transmitted diffracted light from the transmissive diffraction grating corresponding to the input light. The first reflective surface is a variable-angle reflective surface. The second reflective surface has a fixed orientation relative to the transmissive diffraction grating.

Abstract: Optical apparatus includes an electrically-tunable lens, including an electro-optical layer, having, for a given polarization of light incident on the layer, an effective local index of refraction at any given location within an active area of the electro-optical layer that is determined by a voltage waveform applied across the electro-optical layer at the location. Conductive electrodes extend over opposing first and second sides of the electro-optical layer and include an array of excitation electrodes. Control circuitry applies control voltage waveforms to the excitation electrodes. A polarization rotator is positioned and configured to intercept incoming light that is directed toward the lens and to rotate a polarization of the intercepted light so as to ensure that the light incident on the electro-optical layer has a component of the given polarization regardless of an initial linear polarization of the intercepted light.

Abstract: A liquid lens system can include a liquid lens and a controller. The liquid lens can include a chamber, first and second fluids contained in the chamber and substantially immiscible to form a fluid interface therebetween, a plurality of insulated electrodes that are insulated from the first and second fluids, and one or more electrodes in electrical communication with the first fluid. A position of the fluid interface can be based at least in part on voltages applied between the plurality of insulated electrodes and the one or more electrodes in electrical communication with the first fluid. The controller can provide voltages to the plurality of insulated electrodes to tilt the fluid interface along a tilt direction, wherein a second average radius of curvature along a direction orthogonal to the tilt direction differs from a first average radius of curvature along the tilt direction by no more than about 20%.

Abstract: A liquid lens comprising: a lens body including a cavity, a control electrode, and a common electrode; a first liquid disposed within the cavity and in electrical communication with the common electrode; a second liquid disposed within the cavity; an insulating layer in contact with the first liquid and the second liquid and separating the first liquid and the second liquid from the control electrode; and a driver driving a voltage differential across the common electrode and the control electrode, with the first liquid resisting current flow between the common electrode and the control electrode and thereby raising a temperature of the first liquid from a current temperature to a predetermined temperature, which is higher than the current temperature. The driver raises the temperature of the first liquid from the current temperature to the predetermined temperature by increasing a frequency of a voltage waveform of the voltage differential.

Abstract: An adaptive lens (200) may feature two flexible films (202), (204) secured within a rim (210) and defining a space therebetween which is filled with an appropriate fluid (206). A piston (220), driven by at least one actuator (214a-c), may be attached to one of the films (204) to displace it with respect to the remainder of the assembly. Such action of the piston (220) distorts both films (202), (204) to change the shape of the lens and may be driven by bimorph actuators (214a-c). Distance of displacement may be calculated by measuring a magnetic field created by at least one magnet (222a-c) attached to the piston (220). Feedback control may be used to stabilize the apparatus.

Abstract: Provided are 3D glasses capable of reducing crosstalk when disposed on the viewer side of a liquid crystal panel that is time-divisionally driven; an optical device including the 3D glasses; and a three-dimensional image display device including the optical device. The 3D glasses include a right-eye polarizer and a left-eye polarizer, the right-eye polarizer and the left-eye polarizer each including a polarizing plate and a first ?/4 plate, at least one of the right-eye polarizer or the left-eye polarizer including a phase difference layer on or behind a back surface side of the polarizing plate, wherein a phase difference introduced by the right-eye polarizer in a thickness direction at a wavelength of 550 nm is different from a phase difference introduced by the left-eye polarizer in the thickness direction at a wavelength of 550 nm.

Abstract: 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.

Abstract: An active metasurface that provides low-loss and high-bandwidth modulation control of light includes a number of cells arranged on a substrate. A controller dynamically alters a voltage differential supplied to the electrodes of each of the cells is adapted to alter refractive index of each of the high-index dielectric blocks in order to controllably steer light exiting the cell.

Abstract: The present invention relates to a variable light transmittance element including a variable light transmittance structure, wherein the variable light transmittance structure includes: a first electrode; a variable light transmittance layer made of a transparent semiconductor material in which metal nanoparticles are dispersed, and electrically connected to the first electrode; a second electrode; and an insulating layer interposed between the variable light transmittance layer and the second electrode, and also relates to a color filter for a display device and smart window including the same.

Abstract: A method for manufacturing a retroreflective sheet, provided with a retroreflective layer having retroreflective elements on one surface, a back face layer provided to face the retroreflective elements, a coupling portion to couple a part of the retroreflective elements and a part of the back face layer, the method including a preparation step of preparing a resin composition that has a viscosity capable of adhering over a predetermined time after application of predetermined energy, and completes curing after the predetermined time passes, a coating step of applying the resin composition forming the coupling portion on the retroreflective layer or the back face layer, an energy application step of applying the predetermined energy to the resin composition, and a bonding step of bonding the retroreflective layer and the back face layer via the resin composition to which the predetermined energy is applied before the predetermined time passes.

Abstract: A dielectric grating apparatus comprises a substrate; a grating layer, disposed above the substrate; a first interference layer, disposed above the substrate; and a second interference layer, adjacent to the first interference layer, wherein a refractive index of a material of the second interference layer is greater than a refractive index of a material of the first interference layer.

Abstract: An optical device 10 comprises an objective lens 11 defining a focal plane FP and an eyepiece 12 spaced apart therefrom, defining an optical axis OA therethrough. The optical device 10 comprises an optical member 13 having a first planar face 14, arranged on the optical axis OA proximal the focal plane FP, wherein the first planar face 14 is arranged to oppose the objective lens 11. The optical device 10 comprises a filter assembly 100 comprising a first notch filter 101 arranged to attenuate transmission of electromagnetic radiation having a first wavelength ?1, wherein the first notch filter 101 is arranged in front of the optical member 13. The first notch filter 101 is arranged at a first oblique angle ?1 to the optical axis OA whereby, in use, incident electromagnetic radiation having a predetermined wavelength ?i propagating along the optical axis is reflected by the first notch filter 101 away therefrom, wherein the first wavelength ?1 and the predetermined wavelength ?i are different.

Abstract: Provided are a phase retardation device, a preparation method therefor, and a display apparatus. The phase retardation device includes: a linear polarization layer, a first alignment layer, a first liquid crystal layer and a second liquid crystal layer; the linear polarization layer is located on one side of a light source; the first alignment layer is located on a side of the linear polarization layer away from the light source; the first liquid crystal layer is located on a side of the first alignment layer away from the light source; the second liquid crystal layer is located on a side of the first liquid crystal layer away from the first alignment layer, the second liquid crystal layer comprises a first subpart adjacent to the first liquid crystal layer, a second subpart and a third subpart.

Abstract: Optical films, such as reflective polarizer films, and optical systems including the optical films are described. An optical system includes one or more optical lenses having at least one curved major surface, a partial reflector, and a reflective polarizer. For a substantially normally incident light in a predetermined wavelength range extending at least from about 450 nm to about 600 nm: the partial reflector has an average optical reflectance of at least 30%, and the reflective polarizer has an average optical reflectance Rs for a first polarization state, an average optical transmittance Tp for an orthogonal second polarization state, and an average optical reflectance Rp for the second polarization state, where Tp?80%, Rp?1%, and 50%?Rs?95%.

Abstract: Provided is an anti-dazzling device, including a first electrode, a second electrode and a dimming structure, wherein the first electrode and the second electrode are disposed opposite to each other, and the dimming structure is disposed between the first electrode and the second electrode and is configured to change a light transmittance of the anti-dazzling device under action of voltage. An OLED display device and a method for manufacturing an anti-dazzling device are also provided.

Abstract: There is provided a holographic optical element including: a hologram portion including a plurality of groups of unit regions, each group of unit regions of the hologram portion being configured to produce a respective holographic image under a respective light illumination having a respective predetermined wavelength; and a colour filter portion formed on the hologram portion, the colour filter portion including a plurality of groups of unit regions, each group of unit regions of the colour filter portion being arranged on a corresponding group of the plurality of groups of unit regions of the hologram portion, whereby the plurality of groups of unit regions of the colour filter portion is spatially arranged to form a predetermined colour image. There is also provided a method of forming the holographic optical element. There is further provided an article having optical security incorporated therein.

Abstract: A device carrier for an information handling system includes a latch, an interface, lights located on a front of the latch, and first and second light pipes. The latch holds the device carrier within the information handling system. The first light pipes are located within the latch, and provide light to the lights located on the front of the latch. The second light pipes are located within the interface and the latch, and provide the light to the first light pipes. The location of the second light pipes enables the same brightness of the light provided to the lights when a long device is inserted within the device carrier as compared to when a short device is inserted within the device carrier.

Abstract: According to one embodiment, an illumination device includes a first light guide having a first side surface, a second side surface located on a side opposite to the first side surface in a first direction, a first main surface, and a first opposed surface located on a side opposite to the first main surface in a second direction intersecting the first direction and a first light source opposed to the first side surface to emit first P-polarized light to the first side surface, the first side surface is inclined to the first main surface and the first opposed surface, the first light source is inclined to a first straight line perpendicular to the first side surface.

Abstract: A light guide module is provided, which includes a circuit board, one or more light-emitting elements, a light guide plate, a first reflective layer and a second reflective layer. The one or more light-emitting elements are disposed on the circuit board. The light guide plate is located on the circuit board, in which the light guide plate has a thick portion and a thin portion connected to the thick portion, and the thin portion is located over the one or more light-emitting elements, and a side surface of the thick portion adjacent to the thin portion is laterally adjacent to the one or more light-emitting elements. The first reflective layer covers a side surface of the thick portion away from the thin portion. The second reflective layer covers an upper surface of the thick portion and an upper surface of the thin portion.

Abstract: A lighting fixture with segmented emission employing a sheet of an optically transmissive material having a first broad-area surface configured for light output, an opposing second broad-area surface extending parallel to the first broad-area surface and configured for light output, a first edge configured for light input, and an opposing second edge. The lighting fixture further employs a series of compact solid-state light sources optically coupled at least to the first edge, a plurality of patterned light extraction areas distributed over an area of the rectangular sheet and separated from one another and from the first and second edges by separation areas, and a housing encasing the light sources and one or more edges of the rectangular sheet. A width of the separation areas may be less than a length or width dimension of the patterned light extraction areas.

Abstract: The present application discloses a backlight module and a display device. The backlight module includes a substrate and a light guide layer, the substrate has a plurality of light sources; the light guide layer is a patterned structure, and the patterned structure can change a light transmittance of the light guide layer from directly above the light sources to gaps between the light sources. The display device includes the backlight module.

Abstract: A backlight includes a substrate, a plurality of light sources proximate the substrate, a first reflective layer on the substrate, and a plurality of patterned reflectors over the plurality of light sources. Each light source includes a size measured in a plane parallel to the substrate. Each patterned reflector is aligned with a corresponding light source and includes a thickness profile. The thickness profile includes a substantially flat section and a curved section extending from and surrounding the substantially flat section. The substantially flat section varies in thickness by no more than plus or minus 20 percent of an average thickness of the substantially flat section. The substantially flat section includes a size in a plane parallel to the substrate equal to or greater than the size of each light source.

Abstract: An object of the present invention is to provide: an optical element in which incident light can be transmitted or reflected at an angle in the predetermined direction and the wavelength dependence of the amount of transmitted light or reflected light is small; and an optical element including the optical element. The optical element according to the present invention comprises: an optically-anisotropic layer that is formed using a composition including a liquid crystal compound and an infrared absorbing colorant, in which the optically-anisotropic layer has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, and an absorption of the infrared absorbing colorant in a wavelength range of 700 to 2000 nm in a minor axis direction is higher than an absorption of the infrared absorbing colorant in a wavelength range of 700 to 2000 nm in a major axis direction.

Abstract: A double-sided display device includes a first panel, a second panel, a light guide plate and a light source. The second panel is arranged opposite to the first panel. The light guide plate is arranged between the first panel and the second panel, and includes a main body portion including a first surface and a second surface, a first pattern arranged on the first surface, and a second pattern arranged on the second surface. The light source is arranged adjacent to the light guide plate. The first pattern is different from the second pattern.

Abstract: A lightweight stacked optical waveguide using two plastic substrates having nano-structure gratings and a single glass substrate sandwiched between them. The nano-structure gratings face each other, and are each encapsulated within the optical waveguide. The two plastic substrates are each adhesively secured to the central glass substrate rather than to each other to provide sufficient securing strength and precisely establish and maintain an air gap between the substrates. The thickness of the plastic substrates and the glass substrate are selected such that the stacked optical waveguide is lightweight, but also has sufficient drop performance. The stacked optical waveguide can be efficiently manufactured as the adhesive bonds a plastic substrate to a glass substrate.

Abstract: A planar light source includes a light guide member including light-emitting units separated by a groove and one or more light sources disposed in one or more of the light-emitting units. The light-emitting units include outer portions and at least one inner portion located in a region surrounded by the outer portions in a plan view. In the plan view, at least one of the outer portions is adjacent to a smaller number of light-emitting units than a number of light-emitting units to which one of the at least one inner portion is adjacent. In a state in which the same power is supplied and one of the outer portions and one of the at least one inner portion are allowed to individually emit light, brightness of the one of the outer portions is higher than brightness of the one of the at least one inner portion.