A light-emitting device includes: a base portion; a plurality of light-emitting elements disposed on an upper surface of the base portion, the plurality of light-emitting elements including: a first light-emitting element configured to emit first light from a first emitting surface, and a second light-emitting element configured to emit second light from a second emitting surface; and one or more reflective members disposed on the upper surface of the base portion and configured to reflect upward the first light and the second light. The one or more reflective members include: a first reflective surface configured to reflect the first light, a second reflective surface configured to reflect upward the first light that has been reflected at the first reflective surface, and a third reflective surface configured to reflect the second light.

Provided a backlight unit including a light source and a light guide structure configured to guide the light emitted from the light source, the light guide structure includes a first coupler layer including a first output coupler configured to expand light in a first direction and output the expanded light in the first direction to the outside of the light guide structure, and a first expansion coupler configured to expand the light in a second direction perpendicular to the first direction and provide the expanded light in the second direction to the first output coupler, and a second coupler layer including a second output coupler configured to expand light in the first direction and output the expanded light to the outside of the light guide structure, and a second expansion coupler configured to expand light in the second direction and provide the expanded light to the second output coupler.

The present invention can be applied to the technical field pertaining to display devices and, for example, relates to a flat lighting device using a light emitting diode (LED) and a display device including same. The present invention provides a display device including a flat lighting device, wherein the display device may comprise: a light source which emits white light by using a light emitting diode and a yellow phosphor; a red phosphor layer which is disposed on the light source and adsorbs a part of the white light emitted from the light source to emit red light; and a first dichroic filter layer which is disposed on the red phosphor layer and has a reflective pattern reflecting at least a part of the long-wavelength side of the wavelength region of the red light.

An illuminated keyboard including a backlight module and a key structure is provided. The backlight module includes a reflector, a light guide plate, a light source, and a light shielding plate. The light guide plate is disposed on the reflector, and a surface of the light guide plate facing the reflector has multiple microstructures. The light source is located on a light incident surface side of the light guide plate. The light shielding plate is disposed on the light guide plate. The light shielding plate has a shielding area and a light transmissive area, and the microstructures are correspondingly disposed in the light transmissive area. The key structure has multiple keycaps. In the microstructures correspondingly disposed under one single keycap, peaks of any two microstructures adjacent to each other keep different distances from the surface of the light guide plate facing the reflector.

A 3D object information capturing system is provided, including a camera module, a distance measuring module, and a processing module. The camera module captures image information of an object, and the distance measuring module captures distance information of the object. The processing module receives the image information and the distance information respectively from the camera module and the distance measuring module, and constructs a 3D model of the object according to the image information and the distance information.

A backlight module and an electronic device are provided. The backlight module, having a main region and a peripheral region near the main region, includes a light conversion layer, multiple light conversion patterns located in the peripheral region, and multiple light emitting units emitting a light beam. A first portion and a second portion of the light beam emitted respectively from the main region and the peripheral region both have at least one corresponding position in a CIE 1931 color space. One among the at least one corresponding position of the first portion of the light beam has corresponding coordinates (x1, y1). One among the at least one corresponding position of the second portion of the light beam has corresponding coordinates (x2, y2). The corresponding coordinates (x1, y1) and the corresponding coordinates (x2, y2) satisfy the following relation: 0≤|x1−x2|≤0.2.

A self-sanitizing surface structure configured to selectively refract light, a method of fabricating a self-sanitizing surface configured to selectively refract light, and a method of decontaminating a surface using selectively refracted light. A waveguide including a support layer below a propagating layer is positioned over a substrate as a self-sanitizing layer. In the absence of a contaminant or residue on the waveguide, UV light injected into the propagating layer is constrained within the propagating layer due to total internal reflection. When a residue is present on the self-sanitizing surface structure, light may be selectively refracted at or near the interface with the residue along the side of the waveguide to destroy the residue. The self-sanitizing surface structure may be configured to refract a suitable amount of UV light in response to a particular type of residue or application.

According to examples, a phase plate may include a transparent substrate and a photopolymer layer attached to the transparent substrate. The photopolymer layer may adjust a backlight via a phase adjustment and focusing. The phase plate may focus a plurality of red, green, and blue components of the backlight onto respective red, green, and blue subpixels of a thin-film-transistor (TFT) layer deposited thereon. A distance between the photopolymer layer of the phase plate and the plurality of red, green, and blue subpixels of the thin-film-transistor (TFT) layer may be in a range from about 200 μm to about 500 μm. In some examples, the phase plate may be part of a liquid crystal display (LCD) apparatus along with a red, green, blue (RGB) laser to provide backlight; a grating light guide to transmit the backlight; and a liquid crystal display (LCD) layer on the thin-film-transistor (TFT) layer.

A lighting device disclosed in an embodiment of the invention includes a substrate; a plurality of light emitting devices on the substrate; a first reflective layer on the substrate; a resin layer on the first reflective layer; and a second reflective layer on the resin layer. The resin layer includes a first surface from which light emitted from the plurality of light emitting devices is emitted, and a second surface opposite to the first surface, wherein the first surface of the resin layer includes a first exit surface having a first curvature, and a second exit surface having a flat surface or a second curvature, wherein a maximum distance from the second surface to the first exit surface may be greater than a maximum distance from the second surface to the second exit surface.

A directional illuminator for a display apparatus includes a switchable diffuser for tuning a divergence of a light beam illuminating a display panel of the display apparatus. The tunable divergence of the illuminating light beam translates into a tunable exit pupil size at the eyebox of the display apparatus, which may be matched to a pupil size of a user’s eye, thus providing a configurable illumination of the eye pupil. A tiltable reflector in an optical path of the illuminating light beam may be used to shift the location of the exit pupil at the eyebox of the display apparatus.