A beam steering backlight unit provides a hologram image to multiple viewing positions and a holographic display apparatus includes the beam steering backlight unit. The backlight unit includes a light source array comprising a plurality of two-dimensionally arranged light sources and a micro lens array arranged to face the light source array and comprising a plurality of two-dimensionally arranged micro lenses. The light source array includes a plurality of light source blocks each corresponding to a respective one of the plurality of micro lenses, wherein a plurality of the light sources are arranged in each of the plurality of light source blocks. The light source array is configured to select and turn on only those light sources of the plurality of light sources respectively disposed in a same position in each of the plurality of light source blocks and turn off the other light sources.

A light emitting device apparatus of an embodiment comprises: a light source unit for emitting a plurality of excitation lights having linearity; a first reflection unit which reflects the plurality of excitation lights having linearity and incident to an incident direction parallel to an axis of symmetry, and collects the plurality of excitation lights to a focus position; and a wavelength conversion unit which is arranged on the focus position and transmits the plurality of excitation lights reflected and collected by the first reflection unit.

A luminaire assembly includes a substrate; light emitting elements (LEEs) secured to the substrate; optical couplers arranged along the substrate, each optical coupler being positioned to receive light emitting from a corresponding one of the LEEs and to direct the light in a forward direction orthogonal to the substrate; a redirecting surface spaced apart from the couplers along the forward direction to reflect the light from the optical couplers to an ambient environment in a backward angular range; a housing comprising a support structure and a layer of a heat conducting material disposed on the support structure, where a thermal conductivity of the layer of heat conducting material is greater than a thermal conductivity of a material forming the support structure; and a heat coupling layer arranged between the substrate and the housing, the heat coupling layer being adjacent to the heat conducting material of the housing.

The invention provides a light generating system (1000), configured to generate system light (1001), wherein the light generating system (1000) comprises a light source (10), a first luminescent material (210), and a control system (300), wherein: the light source (10) is configured to generate light source light (11) having a tunable spectral power distribution within a first wavelength range (?.sub.x1); wherein the light source (10) comprises a superluminescent diode; the first luminescent material (210) is configured to convert at least part of the light source light (11) into first luminescent material light (211) having one or more wavelengths in a first luminescent material light wavelength range (?.sub.m1); the first luminescent material (210) is configured such that in an operational mode the system light (1001) comprises the first luminescent material light (211); a spectral power distribution of the system light (1001) is controllable in dependence of the spectral power distribution of the light source light (11); and the control system (300) is configured to control the spectral power distribution of the light source light (11).

According to one embodiment, a vehicle lighting device includes a mounting portion that has a recessed portion; a plurality of bayonets that are provided on an outside surface of the mounting portion; a substrate that is provided on a bottom surface of the recessed portion; and a light emitting element that is provided on a side of the substrate opposite to a bottom surface side of the recessed portion. In a case where the vehicle lighting device is viewed from a light emitting side, at least one corner portion of the substrate overlaps with one of the plurality of bayonets.

A light source comprising an excitation light source for providing excitation light, and an optical wavelength conversion member disposed at a distance from the excitation light source. The optical wavelength conversion member comprises an optical wavelength conversion material for converting the excitation light into stimulated light. The light source also comprises an optical-guiding member that allows the excitation light to be incident on the optical wavelength conversion material, and an optical-collecting member for collecting converted light originating from the optical wavelength conversion material. To separate the paths of the converted light and the excitation light, the etendue of the optical-guiding member is less than or equal to of the etendue of the optical-collecting member. This allows the optical-guiding member to draw in the excitation light while preventing the excessive escape of the converted light through the optical-guiding member.

A spot lighting apparatus includes a first reflection unit, a semiconductor light emitting device, a second reflection unit being provided on an optical axis of the semiconductor light emitting device, and a fixing unit fixing the second reflection unit to be separated from the semiconductor light emitting device, wherein the second reflection unit receives a part of a light released from the semiconductor light emitting device and reflects it toward the first reflection unit, the first reflection unit receives a part of a light released from the semiconductor light emitting device and all or a part of a light reflected on the second reflection unit and reflects them toward the opening part, and the light reflected on the first reflection unit and emitted from the opening part is 80% or more of total lights emitted from the opening part.

A signaling/illumination device includes a first and a second potentiometer, configured to enable modulation of at least one Chip on Board LED. The first potentiometer controls the light intensity of the at least one of the Chip on Board LED. The second potentiometer controls the pulse width modulation/strobing of the at least one Chip on Board LED. The device includes a polycarbonate/poly-resin housing with substantially cylindrical exterior profile for attachment to the first and the second potentiometers and a circuit and a power source embedded within the housing for powering the first and the second potentiometers. At least one electrical connection from the circuit and the power source is embedded in the housing and exposed for connection to an external charging source.

A diffuser sheet and display device having the same are provided. The diffuser sheet includes a base layer, a first skin layer on an upper surface of the base layer, and a second skin layer on a lower surface of the base layer. The base layer includes a base resin, a plurality of beads dispersed in the base resin, and a plurality of pores dispersed in the base resin.

An illumination device projects light in a predetermined illumination pattern on a surface. The illumination device includes a housing having a cavity and an aperture that opens into the cavity. The illumination device further includes a light module operatively attached to the housing for selectively emitting the light into the cavity. Furthermore, the illumination device includes a digital light panel at least partially disposed in the cavity between the light module and the aperture. The digital light panel has at least one opening defining a base pattern configuration corresponding to the predetermined illumination pattern for aligning the light emitted from the light module through the opening into the base pattern configuration and subsequently projecting the light through the aperture onto the surface in the predetermined illumination pattern.