A display including a red subpixel, a green subpixel, a blue subpixel and a fourth subpixel including a teal subpixel or a saturated green pixel and an LED light source. Liquid crystal display devices including U.sup.6+-containing phosphors are also provided. Applications for the display include televisions, mobile phones and computer monitors.

The present invention relates to a backlight unit for use in a display device. The backlight unit includes a circuit board, at least one light-emitting diode chip mounted on the circuit board, a plurality of reflection members arranged on the upper part of the light-emitting diode chip, and a light diffusing member. The light diffusing member has an incident surface on which light enters and an emitting surface from which light is emitted. The light diffusing member is arranged on the upper part of the circuit board. The plurality of reflection members are stacked on each other and reflect a part of light emitted from the upper surface of the light-emitting diode chip.

Disclosed is an LED luminaire, comprising a housing positionable at a building structure location. The housing has at least one light output boundary and configured to direct light therein toward the light output boundary. A light guide configured to be located at the light output boundary to receive light operationally contained within the housing, so as to emit non-directional light at the light output boundary. At least one first LED light engine is located within the housing, the at least one first LED light engine including at least one first LED light source to emit directional light at the light output boundary.

A lighting device producing white light having a target color correlated temperature (CCT) value includes an LED array having one or more red LEDs, one or more warm white LEDs, and one or more cool white LED; one or more photo-luminescent materials for shifting the CCT value of the light emitted from the cool white LED toward a green CCT value and/or the CCT value of the light emitted from the warm white LED toward a yellow CCT value; and a waveguide material having a mixing region for mixing the shifted and unshifted light so as to generate white light having the target CCT value and an output region for outputting the white light.

A light emitting module includes at least one light source, a light guide member having a demarcating groove configured to demarcate at least one light emitting region, and at least one light source arrangement part located in each of the at least one light emitting region and accommodating a light source, a first light-reflecting member disposed in the demarcating groove, and a wavelength converting member covering an upper surface of the light guide member.

A display engine adapted for use in a head-mounted display (HMD) device includes a reflective liquid crystal on silicon (LCoS) spatial light modulator (SLM) that is illuminated using a backlight illumination module and a pair of optical prisms providing a total internal reflection (TIR) function. In an illustrative mixed-reality embodiment, the TIR prism pair guides light to the LCoS SLM from the backlight illumination module and projects virtual images reflected from the LCoS SLM, through projection optics, to a diffractive waveguide combiner for viewing by an HMD user.

A planar light source includes a light guide member having a through hole, a light source, a first light adjusting member, a second light adjusting member, and a light transmissive member. The first light adjusting member having reflectivity and transmissivity with respect to light from the light source is disposed on or above an upper face of the light source in the through hole. The second light adjusting member having reflectivity and transmissivity with respect to the light from the light source is disposed above and apart from the first light adjusting member. The first light transmissive member having a higher transmissivity with respect to the light from the light source than the transmissivities of the first and second light adjusting members is disposed between the first light adjusting member and the second light adjusting member, and between a lateral face of the light source and the light guide member.

The invention relates to a function display (1) for selectively displaying several symbols representing one switching function, respectively, and/or at least two switching states, respectively, comprising: a light guide stack which, given an attachment of the function display (1) as intended, forms a display surface (8) facing towards the observer (B); wherein the light guide stack is formed from at least two transparent or translucent, planar light guides (2, 3) arranged in an overlaid manner in a stacking direction, which are arranged so as to be spaced apart by a transparent or translucent layer consisting of a material that is optically thinner compared to the adjacent light guides (2, 3), preferably an air gap (14), so that the light guides (2, 3) each have a main surface (H) facing towards the observer (B) and a main surface (H′) facing away from the observer (B), and, in at least one light guide (2), the main surface (H′) facing away from the observer (B) faces towards a light guide (3) which is most closely adjacent in the opposite direction to the stacking direction;

at least one light source (5, 5′) per light guide (2, 3), which is arranged such that in each case, its light (L, L′), via an end face (11) of an associated light guide (2, 3) facing towards the light source (5, 5′), is coupled into the respective light guide (2, 3); wherein, further, at least one microstructured symbol area (12a, 12b) provided in or on the light guide (2, 3) is provided for each light guide (2, 3), which is configured, if the light source (5, 5′) is respectively activated, to be visible, illuminated by the light (L, L′) coupled into the light guide (2, 3), to the observer (B); a circuit board (7) on which the several light sources (5, 5′) are arranged and fixed; a panel (6) fixed to the light guide stack by substance-to-substance connection and/or non-positively and/or positively, to which the circuit board (7) is fixed while resting against a mounting surface (15), wherein two light sources (5′) of the circuit board serve as an alignment aid in attaching the circuit board (7) and the panel (6); and an associated assembly method.

A wavelength conversion member including a wavelength conversion layer containing a fluoride phosphor, quantum dots, a surfactant, and a resin. The fluoride phosphor contains fluoride particles having a specific composition and having particle size values within specific ranges. The quantum dots include at least one selected from a first crystalline nanoparticle and a second crystalline nanoparticle. The first crystalline nanoparticle has a specific composition. When irradiated with light having a wavelength of 450 nm, the first crystalline nanoparticle emits light having an emission peak at a wavelength in a range from 510 nm to 535 nm, and a full width at half maximum of the emission peak of the first crystalline nanoparticle is in a range from 10 nm to 30 nm. The second crystalline nanoparticle includes a chalcopyrite-type crystalline structure, and a full width at half maximum of the emission peak of the second crystalline nanoparticle is 45 nm or less.

Provided is a lighting assembly including an upper body that defines a top surface thereof; a lower body coupled to a lower portion of the upper body and defining a bottom surface thereof; a light diffusion member coupled to the upper body and the lower body, the light diffusion member including a first surface facing the upper body, a second surface facing the lower body, and a third surface that has a curved surface and is exposed to an outside of the light diffusion member; a light guide made of a light transmissive material, the light guide being in contact with the light diffusion member; and a light-emitting diode (LED) disposed to face a surface of the light guide.