A light-emission device includes at least one emission module comprising: a luminescent crystal known as a concentrator crystal with at least six faces which are parallel in pairs, including a first and a second face, known as lateral faces, perpendicular to a direction x and separated by a distance corresponding to a horizontal dimension of the concentrator in the direction x; a first mirror, which is configured such as to cover the first lateral face at least partly, defining a surface area covered by the first mirror, and at least one surface area (SFS1) which is not covered by the first mirror defining an associated output face; a second mirror, which is configured such as to cover at least 95% of the second lateral face; a brightness triggering element, which is designed to generate emission of brightness radiation (L.sub.F) in the luminescent crystal; a ratio R between the non-covered surface area (SFS1) and a surface area (S.sub.L) of the first lateral face being determined such that rays of the brightness radiation are reflected on the first and second mirrors, and are propagated over a mean distance L.sub.moy such that

[00001]$L_p=\frac{1}{\alpha }>L_{\mathrm{moy}}\gg L$

within the luminescent crystal before passing through at least one output face, forming an output beam, where α is a coefficient of loss per unit of length of the concentrator for the brightness radiation.

A texture recognition device and a display device are provided. The texture recognition device includes a backlight element, configured to provide first backlight; a light constraint element, configured to perform a light divergence angle constraint process on the first backlight to obtain second backlight with a divergence angle within a preset angle range, the second backlight being transmitted to a detection object; and a photosensitive element, configured to detect the second backlight reflected by a texture of the detection object to recognize a texture image of the texture of the detection object.

The invention relates to a luminaire comprising a stack of parallel light transmissive transparent plates comprising a light guide plate and an optical plate. The light guide plate comprises a first and a second major light guide surface and a circumferential edge-wall and is edge-lit by LEDs. At least one of the major light guide surfaces is provided with a light outcoupling structure comprising outcoupling elements arranged at a first pitch P1. The optical plate comprises a first and a second major optical surface, the first major optical surface facing towards the second major light guide surface and only one of the first and second major optical surfaces being provided with an optical structure comprising optical elements arranged at a second pitch P2. The second major light guide surface and the first major optical surface are spaced apart in a direction perpendicular to the major light guide surface by a spacing S, with S being in the range of 0-12 mm. P1 and P2 are in the range of 1-7 mm and a ratio between P1 and P2 is in the range of 0.5-2.

A method of manufacturing a planar light source includes: providing a wiring substrate; locating a light guide plate on a first principal face of the wiring substrate, wherein the light guide plate includes a plurality of unit regions arranged in one dimension or two dimensions, and a plurality of through holes that are open at the a principal face and a second principal face of the light guide plate, wherein at least one of the through holes is located in the unit regions; locating light sources in the through holes in the unit regions on the first principal face of the wiring substrate; locating a first light transmissive member in a first of the through holes; and locating a second light transmissive member in the first through hole.

Embodiments of a dual-sided transparent display panel are presented herein. One embodiment comprises a first panel subassembly and a second panel subassembly, each of the first and second panel subassemblies including a plurality of adjacent layers, the plurality of adjacent layers including, from an innermost layer to an outermost layer, a first electrode layer, a first polyimide layer, a liquid-crystal matrix, a second polyimide layer, a second electrode layer, and a glass layer; a waveguide disposed between an inner surface of the first electrode layer of the first panel subassembly and an inner surface of the first electrode layer of the second panel subassembly; and one or more light sources disposed along an edge of the waveguide that is perpendicular to the inner surface of the first electrode layer of the first panel subassembly and the inner surface of the first electrode layer of the second panel subassembly.

A light-emitting assembly includes a substrate and a plurality of light-emitting elements. The substrate includes a component arrangement region and a planar region in a top view, and includes a base material layer, a filled layer and a protection layer in a sectional view. A thickness of the filled layer is greater than a thickness of the protection layer. The thickness of the protection layer is greater than 0 μm and less than 30 μm. The plurality of light-emitting elements are located on the component arrangement region. This disclosure can improve the non-uniform brightness issue (hotspots) or enhance the optical performance.

A collimated backlight and an electronic display employ a light guide having angle-preserving scattering feature and an absorption collimator. The angle-preserving scattering feature is configured to scatter a portion of guided light out of the light guide as emitted light. The absorption collimator includes an absorption element and is configured to convert light provided by a light source into collimated light to be guided as the guided light. The electronic display includes an array of light valves and may be configured as a multiview display or a privacy display.

A backlight module includes a flexible circuit board and a light guide plate. A first light source assembly, a second light source assembly, and a positioning member are disposed on the flexible circuit board. The light guide plate is disposed over the flexible circuit board and includes a first single key light guide area, a second single key light guide area, and a connection area. The first single key light guide area has a first through hole accommodating the first light source assembly. The second single key light guide area has a second through hole accommodating the second light source assembly. The connection area is located between the first and second single key light guide areas and has an accommodating hole. The flexible circuit board is overlapped with the light guide plate with the positioning member being accommodated in the accommodating hole.

A variety of illumination devices are disclosed that are configured to manipulate light provided by one or more light-emitting elements (LEEs). In general, embodiments of the illumination devices feature one or more optical couplers that redirect illumination from the LEEs to a reflector which then directs the light into a range of angles. In some embodiments, the illumination device includes a second reflector that reflects at least some of the light from the first reflector. In certain embodiments, the illumination device includes a light guide that guides light from the collector to the first reflector. The components of the illumination device can be configured to provide illumination devices that can provide a variety of intensity distributions. Such illumination devices can be configured to provide light for particular lighting applications, including office lighting, task lighting, cabinet lighting, garage lighting, wall wash, stack lighting, and downlighting.

A light-emitting module includes a light guide plate including a first surface, and a second surface opposite to the first surface; a light-emitting device disposed at a second surface side of the light guide plate; a first light-reflective member provided at a periphery of the light-emitting device at the second surface side; and a second light-reflective member provided outward of the first light-reflective member at the second surface. A diffuse reflectance of the first light-reflective member for light emitted by the light-emitting device is greater than a diffuse reflectance of the second light-reflective member for the light emitted by the light-emitting device.