A lighting device includes a first light source to emit first light; a diffuser to receive the first light and emits first scattered light; and a frame to support the first light source and the diffuser. The the diffuser includes nanoparticles, and guides the received first light, scatters it with the nanoparticles, and emits it as the first scattered light. The diffuser includes an incident surface to receive the first light, a first surface on which an emission surface to emit the first scattered light is formed, and a second surface opposite the first surface. The incident surface is at a first edge portion of the diffuser, the frame is opened to expose at least a portion of a region on the first surface of the diffuser in which the emission surface is formed and a region on the second surface corresponding thereto.

The present disclosure is directed to an illumination device for providing a divergent illumination. The illumination device comprises a light source for emitting light in a visible spectrum; an output aperture, through which the light emitted from the light source exits the illumination device; and a layer structure. The layer structure comprises a scattering layer of a plurality of nanoscale scattering elements embedded in a host material and is positioned in an optical path of the emitted light that extends between the light source and the output aperture. The layer structure comprises further a pair of areal electrical contact layers, wherein the areal electrical contact layers extend at opposite sides of the scattering layer and are electrically connectable with a power source to generate an electric field across the scattering layer. The divergent illumination provided by the illumination device is characterized by at least one luminous intensity distribution curve having the full width at half maximum of at least 10°.

A foldable electronic display having a layered sheet-form structure including a flexible support substrate sheet having a generally rectangular shape with rounded corners and a longer dimension of at least 100 mm and including a layer of a relatively hard optically transparent material having a substantially uniform thickness and a Young's modulus of at least 1 GPa, a flexible front sheet, a flexible PCB substrate, a two-dimensional array of at least 1,000,000 individually digitally addressable solid-state light emitting devices distributed over an area of the flexible PCB substrate and arranged into parallel rows and columns, one or more layers of an adhesive material, a plurality of rigid heat-conductive substrates spaced apart from one another and each having a metallic layer, and one or more fold areas located in spaces between the rigid heat-conductive substrates.

A foldable electronic display having a layered sheet-form structure including a flexible support substrate sheet having a generally rectangular shape with rounded corners and a longer dimension of at least 100 mm and including a layer of a relatively hard optically transparent material having a substantially uniform thickness and a Young's modulus of at least 1 GPa, a flexible front sheet, a flexible PCB substrate, a two-dimensional array of at least 1,000,000 individually digitally addressable solid-state light emitting devices distributed over an area of the flexible PCB substrate and arranged into parallel rows and columns, one or more layers of an adhesive material, a plurality of rigid heat-conductive substrates spaced apart from one another and each having a metallic layer, and one or more fold areas located in spaces between the rigid heat-conductive substrates.

The present disclosure is directed to a direct-light generator (10) for sun-sky-imitating illumination devices (100) configured for generating natural light similar to that from the sun and the sky, comprising a first emitting surface (22) and an array of light-emitting devices (21) configured to generate from a primary light a direct light (13) which exits the first emitting surface (22) along a direct light direction (15), wherein the direct light (13) exiting the first emitting surface (22) has a luminance profile (Ldirect(x, y, θ, φ)) which has a narrow peak (14) in the angular distribution around the direct-light direction (15) and is uniform across the first emitting surface (22), wherein each light-emitting device (21) comprises a light emitter (24) having an emitting surface and at least a pair of collimation lenses (25,27) illuminated by the light emitter (24), each pair of collimation lenses (25,27) comprising a pre-collimation lens (27) comprising a light inlet surface (27a) facing the light emitter (24) emitting surface and a light outlet surface (27b), the pre-collimation lens (27) being positioned proximal to the light emitter (24) and a collimation lens (25) comprising a light input surface (25a) and a light output surface (25b), the collimation lens (25) being positioned distal from the light emitter (24), the light emitter (24) and the pre-collimation lens (27) being housed in a hollow housing (26) which is internally coated or made of light absorbing material and has at least an aperture where the collimation lens (25) is positioned, wherein the pre-collimation lens (27) of each pair of collimation lenses (25,27) is configured to emit with a substantially angularly constant intensity and to uniformly illuminate a whole light input surface (25a) of the collimation lens (25) of the pair of collimation lenses (25,27) wherein, with the pre-collimation lens having a pre-collimation lens height (b2), and a base of the input surface (25a) of the collimation lens (25) being spaced apart from a base of the inlet surface (27a) of the pre-collimation lens (27) of a lenses distance (h), the ratio (b2/h) between the pre-collimation lens height (b2) and the lenses distance (h) is comprised in the range of 0.2-0.8, more preferably in the range between 0.25-0.75 and even more preferably in the range be

The present disclosure is directed to a direct-light generator (10) for sun-sky-imitating illumination devices (100) configured for generating natural light similar to that from the sun and the sky, comprising a first emitting surface (22) and an array of light-emitting devices (21) configured to generate from a primary light a direct light (13) which exits the first emitting surface (22) along a direct light direction (15), wherein the direct light (13) exiting the first emitting surface (22) has a luminance profile (Ldirect(x, y, θ, φ)) which has a narrow peak (14) in the angular distribution around the direct-light direction (15) and is uniform across the first emitting surface (22), wherein each light-emitting device (21) comprises a light emitter (24) having an emitting surface and at least a pair of collimation lenses (25,27) illuminated by the light emitter (24), each pair of collimation lenses (25,27) comprising a pre-collimation lens (27) comprising a light inlet surface (27a) facing the light emitter (24) emitting surface and a light outlet surface (27b), the pre-collimation lens (27) being positioned proximal to the light emitter (24) and a collimation lens (25) comprising a light input surface (25a) and a light output surface (25b), the collimation lens (25) being positioned distal from the light emitter (24), the light emitter (24) and the pre-collimation lens (27) being housed in a hollow housing (26) which is internally coated or made of light absorbing material and has at least an aperture where the collimation lens (25) is positioned, wherein the pre-collimation lens (27) of each pair of collimation lenses (25,27) is configured to emit with a substantially angularly constant intensity and to uniformly illuminate a whole light input surface (25a) of the collimation lens (25) of the pair of collimation lenses (25,27) wherein, with the pre-collimation lens having a pre-collimation lens height (b2), and a base of the input surface (25a) of the collimation lens (25) being spaced apart from a base of the inlet surface (27a) of the pre-collimation lens (27) of a lenses distance (h), the ratio (b2/h) between the pre-collimation lens height (b2) and the lenses distance (h) is comprised in the range of 0.2-0.8, more preferably in the range between 0.25-0.75 and even more preferably in the range be

A stretchable sheet-form electronic display having a generally rectangular shape with four edges, a thickness of less than 1.5 mm, and a longer dimension of at least 100 mm. The stretchable sheet-form electronic display includes an elastic substrate sheet comprising a thin layer of an optically transmissive material having a relatively high elastic range, a grid of flexible connecting members and a two-dimensional array of at least 100,000 digitally addressable solid-state light emitting devices such as micro OLEDs or LEDs. At least some of the solid-state light emitting devices may be arranged into light emitting clusters and directly or indirectly mounted to a plurality of support pads. The solid-state light emitting devices within the clusters may be configured for emitting light in different colors such as blue, red, and green.

A stretchable sheet-form electronic display having a generally rectangular shape with four edges, a thickness of less than 1.5 mm, and a longer dimension of at least 100 mm. The stretchable sheet-form electronic display includes an elastic substrate sheet comprising a thin layer of an optically transmissive material having a relatively high elastic range, a grid of flexible connecting members and a two-dimensional array of at least 100,000 digitally addressable solid-state light emitting devices such as micro OLEDs or LEDs. At least some of the solid-state light emitting devices may be arranged into light emitting clusters and directly or indirectly mounted to a plurality of support pads. The solid-state light emitting devices within the clusters may be configured for emitting light in different colors such as blue, red, and green.

A lighting device that provides visible illumination with enhanced emission in the range 460-520 nm with a M/P ratio of XI, where XI is at least 0.7, a correlated color temperature of 4000-14000 K, and an average color rendering index of at least 70.

A Rayleigh scatter light has a first layer and a second layer above the first layer. An LED emitter is mounted in the first layer. The LED emitter is configured to emit light. A focusing lens assembly is mounted in the first layer, and the focusing lens focuses light emitted from the LED emitter into a focused beam. A is mounted in the first layer. The near field mirror receives the focused beam and reflects a mirrored beam from the focused beam. A far field mirror is mounted in the second layer above the near field mirror. The far field mirror receives the mirrored beam from the near field mirror. The far field mirror reflects the mirrored beam to an angled beam. A Rayleigh scatter board is translucent and receives the angled beam which partially scatters when passing through the Rayleigh scatter board.