The invention provides a lighting device (1) comprising: —one or more light sources (10) configured to provide light source light (11); —a luminescent element (5) comprising an elongated luminescent body (100) having a radiation input face (111) for receipt of the light source light (11), the luminescent element (5) comprising a first luminescent material (120) for conversion of at least part of the light source light (11) into luminescent material light (8); —a light guide element (850), configured downstream of the first luminescent material (120), and configured to light guide at least part of the first luminescent material light (8); —a second luminescent material (1120), configured downstream of the first 10 luminescent material (120), at a first distance (d1) of at least 0.5 mm thereof, configured to convert one or more of (i) at least part of the light source light (11) and (ii) at least part of the first luminescent material light (8) into second luminescent material light (1128) having a spectral power distribution differing from a spectral power distribution of the first luminescent material light (8); 15—a light transmissive optical element (24) configured downstream of the light guide element (850), configured to receive at least part of the first luminescent material light (8) of the light guide element (850) and to receive at least part of the second luminescent material light (1128), and configured to transmit the received luminescent material light (8) and the received second luminescent material light (1128), and configured to beam shape at least part of the received luminescent material light (8), and to provide lighting device light (101) comprising one or more of the light source light (11), the first luminescent material light (8) and the second luminescent material light (1128).

An alarm indicator (4) is provided with a light guiding member (41), a first light source (42) and a transmissive member (43). The light guiding member (41) extends in a first direction that is parallel to a display screen in which medical information is displayed. The first light source (42) faces an end face (41a) of the light guiding member (41) in the first direction. The transmissive member (43) covers the light guiding member (41) from a second direction intersecting with the first direction. The light guiding member (41) is provided with a light reflecting portion and an outer face (41d). The light reflecting portion extends in the first direction and reflects the light incident from the end face (41a) at least toward the second direction intersecting with the first direction. The light reflected by the reflecting portion is emitted from the outer face (41d) while being diffused.

A display system includes a first die configured to emit light of a first color, a second die configured to emit light of a second color and a third die configured to emit light of a third color. The display system also includes a lens system and an optical waveguide system. The optical waveguide system includes a first grating portion configured to couple in an incident light to the optical waveguide and a second grating portion configured to couple out a transmitting light from the optical waveguide. The first die, the second die and the third die are contained in one package. The lens system is arranged between the package and the optical waveguide system, and is configured to collimate the light of the first color, the light of the second color and the light of the third color onto the first grating portion of the optical waveguide system.

Provided is an image sensor lighting unit including at least one light guide extending in a main scanning direction; a first light source group facing a first end surface of at least two end surfaces of the at least one light guide in the main scanning direction; and a second light source group facing a second end surface of the at least two end surfaces. The first light source group includes a first light source that emits light having a predetermined wavelength band. The second light source group includes a second light source that emits light having the wavelength band. An X-coordinate of the first light source in a corresponding XY-coordinate system is equal in absolute value to an X-coordinate of the second light source in a corresponding XY-coordinate system, with the at least one light guide viewed from the first end surface side in the main scanning direction.

According to an aspect of the present disclosure, a luminaire comprises a housing and at least one waveguide comprising first and second opposite waveguide ends, a coupling portion disposed at the first waveguide end, and a light emitting portion disposed between the first and second waveguide ends. The luminaire is further arranged such that the first waveguide end is disposed adjacent a first luminaire end and the second waveguide end is disposed at a second luminaire end opposite the first luminaire end. Still further, the luminaire comprises at least one LED element disposed within the housing adjacent the coupling portion of the at least one waveguide such that the at least one waveguide provides a first illumination pattern and the at least one waveguide is interchangeable with another waveguide that provides a second illumination pattern.

A display apparatus including a display panel, a light source unit configured to provide light to the display panel, and a light guide member disposed between the display panel and the light source unit and covering the light source unit such that the light source unit is buried in the light guide member, the light guide member having a surface roughness on an upper surface thereof to diffuse light and including a substrate, and a light emitting device disposed on the substrate and including a blocking pattern to have an intensity of light emitted in an upward direction to be equal to or less than about 80% of a maximum light intensity of the light emitting device.

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.

Time-multiplexed backlighting includes a time-multiplexed light source to provide a light beam having a first non-zero propagation angle during a first time interval and a second non-zero propagation angle during a second time interval. A time-multiplexed backlight includes a light guide configured to guide the light beam and a diffraction grating configured to coupled out a portion of the guided light beam with a different principal angular direction in each of the first time interval and the second time interval. A multiview display includes the time-multiplexed light source and a multibeam backlight to provide coupled-out light beams during each of the first and second time intervals, wherein the principal angular directions of the coupled-out light beams correspond to different view directions of the multiview display.

A backlight module includes a case body, supporting structures, light-emitting elements, and an optical module. The case body includes a first side wall and a second side wall opposite to the first side wall. Each of the support structures includes two supporting members and a bearing member. Two supporting members are respectively disposed on the first side wall and the second side wall. Each of the supporting member includes a fitting portion, an extending portion, and a bending portion. The fitting portion is fixed to the first side wall and the second side wall. The bearing member is disposed between the two supporting members. The light-emitting elements are respectively disposed on the bearing surface of the bearing member of the corresponding supporting structures. The optical module is disposed on the extending surface of the extending portion of each of the supporting structures. A display device is also provided.