Disclosed are a backlight unit and a display device including the same. The backlight unit and display device can minimize a change in an optical layer when exposed to hostile environments, such as high and low temperature environments. The backlight unit and the display device have a rigid structure, due to the minimized change in the optical layer even when exposed to hostile environments, such as high and low temperature environments.

A substrate (200) is provided having a multi-layer structure (202) disposed thereon. The multi-layer structure includes a plurality of meta-layers, each meta-layer including a hard mask layer (206a-d) including a hard mask material, and a spacer layer (208a-c) on which the hard mask layer is disposed, the spacer layer including a spacer material. A replication material is disposed on a surface of the multi-layer structure. A replication pattern including a first replication feature (212a) and a second replication feature (212b, 212c) is imprinted into the replication material. The first replication feature and the second replication feature have different heights. A plurality of etching processes are performed on the replication material, the multi-layer structure, and the substrate, to obtain a substrate pattern including a first substrate feature and a second substrate feature.

A light source assembly is provided, including a substrate; a light-emitting element disposed on the substrate; and an optical film at least partially overlapped with the substrate. A diffuser film is at least partially overlapped with the optical film, wherein a haze of the diffuser film is greater than 85%, and a thickness of the diffuser film ranges from 0.04 mm to 0.35 mm. The optical film and the diffuser film are capable of transmitting at least a part of light emitted from the light-emitting element.

A light transmissive structure includes a light transmissive substrate having first and second opposing faces and array of microprism elements on the first face. A respective microprism element includes at least one ring comprising a plurality of microstructure pyramids that is rotated randomly and/or pseudorandomly on the first face about an axis that is orthogonal to the substrate relative to at least one other microprism element. The light transmissive structure is configured to receive light from a light source facing the first face and distribute the light emerging from the second face in a 2D batwing distribution.

A diffusion element and manufacturing method thereof, a backlight module and a display device are provided. The diffusion element including a non-woven fabric diffusion sheet, wherein the non-woven fabric diffusion sheet includes a substrate of non-woven fabric and a diffusion particle layer attached to at least one surface of the substrate. The diffusion element has the advantages of low cost, high yield and simple processes.

An object is to provide a daylighting sheet which efficiently performs daylighting and in which, when the daylighting sheet is applied to a window of a building or the like, it is possible to see an outdoor side.

The daylighting sheet includes a translucent base material layer; and a light deflection layer that is formed on the base material layer, and the light deflection layer includes: light transmission portions that are aligned along one surface of the base material layer so as to be able to transmit light, each of which including a groove at a portion being in a light entering side in a position where the light transmission portion is arranged in the opening portion of a building; and light deflection portions that are formed between the light transmission portions and filled with a material whose refractive index is lower than that of the light transmission portions.

A method for injection moulding an optical component (20), e.g. a cover for a luminaire, with an incorporated optical function, the component (20) comprising an injection moulded body (18) and at least one optically functional relief structure (4) applied thereto, the relief structure (4) forming or contributing to the optical function of the component (20) to be moulded, wherein the method comprises: (i) providing an insert (2) comprising the said optical structure (4) in the form of an open-face relief structure (4) provided on a face, surface or portion of the insert (2), (ii) mounting the insert (2) inside a mould cavity (11) in which the component (20) is to be moulded, with the open-face relief structure (4) facing and at least partially abutting a surface portion of the mould cavity (11), and (iii) rear-injection moulding a body (18) of the component (20) within the mould cavity (11) so as to incorporate the insert (2) in the component body (18), wherein the said method is carried out with parameters selected and/or controlled such that during the injection moulding step (iii) the temperature at or on the face, surface or portion of the insert (2) provided with the relief structure (4) remains below the lowest of the glass transition temperature, melting temperature and temperature of onset of thermal decomposition of the material of that face, surface or portion of the insert (2).

An optically diffusive film (200) includes a plurality of particles (10) dispersed in a binder (20). The particles (10) and the binder (20) have respective indices n1b and n2b along a same in-plane block-direction of the optically diffusive film (200), and respective indices n1p and n2p along an in-plane pass-direction orthogonal to the block-direction, such that for at least a first wavelength in a first wavelength range extending from about 400 nm to about 1000 nm: a magnitude of a difference between n1b and n2b is greater than about 0.05; and a magnitude of a difference between n1p and n2p is less than about 0.05. For substantially normally incident light and for at least the first wavelength, the optically diffusive film (200) may be more optically diffuse for a light polarized along a block-direction (b) and less optically diffusive for light polarized along an orthogonal pass-direction (p).

A light-diffusing-member manufacturing method includes a step of forming a light diffusion portion on one surface side of a base, by developing an exposed negative photosensitive resin layer with an alkali developing solution, and a step of performing an acid treatment on the light diffusion portion with an acid solution, after removing the alkali developing solution which is adhered to the light diffusion portion and suspended matter in the alkali developing solution in the negative photosensitive resin layer, so as to lower an ionization degree of the negative photosensitive resin layer which is in an ionized state due to the alkali developing solution.

An object is to provide a daylighting sheet which efficiently performs daylighting and in which, when the daylighting sheet is applied to a window of a building or the like, it is possible to see an outdoor side. The daylighting sheet includes a translucent base material layer; and a light deflection layer that is formed on the base material layer, and the light deflection layer includes: light transmission portions that are aligned along one surface of the base material layer so as to be able to transmit light, each of the light transmission portions including a portion that is convex upwards; and light deflection portions that are formed between the light transmission portions and filled with a material whose refractive index is lower than that of the light transmission portions.