An optical assembly for optical aperture expansion combines facet reflective technology with diffractive technology. At least two diffractive components having opposite optical power (matching) are used, so that chromatic dispersion introduced by the first diffractive component will then be cancelled by the second diffractive component. The two diffractive components are used in combination with a reflective optical component to achieve more efficient aperture expansion (for near eye display), reducing distortions and noise, while also reducing design constraints on the system and individual components, as compared to conventional techniques. The assembly eliminates and/or reduces the need for polarization management, while enabling wider field of view. In addition, embodiments can have reduced nonuniformity, as compared to conventional single technology implementations, since the distortion patterns of the two technologies do not correlate.

The invention provides a lighting device (1) comprising (i) a plurality of sets (310) of each one or more light sources (10) configured to provide light source light (11), and (ii) a plurality of luminescent elements (5), each luminescent element (5) comprising an elongated luminescent body (100) having a radiation input face (111) for receipt of the light source light (11), each luminescent element (5) comprising a luminescent material (120) for conversion of at least part of the light source light (11) into luminescent material light (8), and each luminescent element (5) have an luminescent element exit window (12) for the luminescent material light (8); wherein the luminescent elements (5) are configured in a configuration wherein an average distance (d1) between neighboring luminescent bodies (100) is larger than a shortest luminescent element exit window distance (d2) between the neighboring luminescent element exit windows (12), thereby defining an interspace (320) between the neighboring luminescent bodies (100).

A unitary lightguide including a first lightguide section extending along a first direction and a second lightguide section extending along a second direction is described. The second lightguide section includes a plurality of light extractors for extracting light that would otherwise propagate within and along the second lightguide section. The unitary lightguide includes a boundary region disposed between and joining the first and second lightguide sections and including a plurality of spaced apart light redirecting features. Each light redirecting feature includes a first portion extending substantially parallel to the first direction, and a second portion extending from proximate the first end of the first portion toward the second lightguide section and making an angle with the first portion in a range from about 10 degrees to about 70 degrees.

A light guide component, a backlight module and a display device are provided. The light guide component includes: a first light guide member including a first surface and a second surface opposite to each other, where a plurality of lattice points for the light emission are arranged on the first surface; a plurality of second light guide members fixed to the second surface, where each second light guide member has a light-incidence side surface through which the light emitted by the edge-lighting light source enters into the second light guide member.

A lighting fixture includes a housing, a first light source, a light guide plate, and a second light source. The housing has an inner cavity and a mounting hole, the mounting hole communicates the inner cavity with an external environment of the housing, the light guide plate is installed in the mounting hole. A side of the light guide plate faces the inner cavity, the other side of the light guide plate faces an outside of the housing. The second light source projects second light to the light guide plate, the second light is capable of being projected to the outside of the housing through the light guide plate. The first light source projects first light, and is configured such that the first light is projected to the outside of the housing through the light guide plate, and the housing is a non-light-transmitting housing.

A lamp assembly for a motor vehicle comprises a light source and a light guide, which includes a diffuser body having a diffuser inlet and a light emission portion. The diffuser body is configured to conduct light rays from the diffuser inlet to the light emission portion, so as to be visible to an observer. The light guide also includes an extension with a light collector configured to collect rays emitted by the light source, a coupling portion, and a guide body configured to conduct light rays between the light collector and the coupling portion. The coupling portion is optically coupled to the light inlet portion of the diffuser body for transmitting the light rays from the extension into the diffuser body. The diffuser body is made of a material with high light diffusion properties and the extension is made of material with relatively poor light diffusion properties.

A wearable illumination devices is provided, including a first light source coupled to a first light guide, a second light source coupled to a second light guide, and a support connected between the first and second light guides, wherein the first light source is configured to illuminate the first light guide and the second light source is configured to illuminate the second light guide.

A manufacturing method of waveguide and a head mounted display device having the waveguide are provided. The head mounted display device is configured to be placed in front of at least one eye of a user, and includes a display unit, the first waveguide and the second waveguide. The display unit is configured to provide an image beam. The first waveguide is located between the display unit and the second waveguide. The first waveguide is configured to transmit the image beam to the second waveguide and adjust a light shape of the image beam to maintain a field angle and expand a pupil in a single dimension. The second waveguide is configured to transmit the image beam to the at least eye of the user, and the second waveguide can extend a light transmission path and provide a uniform image beam.

A multi-directional backlight and a multi-user multiview display provide emitted light and associated multiview images having different mutually exclusive angular ranges and different user-specific view zones. The multi-directional backlight includes first and second multiview backlights, each of which includes multibeam elements configured to provide emitted light having directional light beams with directions corresponding to view directions of a respective multiview images. The emitted light provided by the first multiview backlight has a first angular range that is mutually exclusive of a second angular range of emitted light provided by the second multiview backlight, at respective first and second convergence distances. The multi-user multiview display includes a first multiview display configured to provide a first multiview image to a first user in a first view zone and a second multiview display configured to provide a second multiview image to a second user in a second view zone.

A waveguide illumination system employing an optically transmissive sheet, which is used to guide light using a total internal reflection, and a strip of heat-conducting printed circuit located near an edge of the sheet and having a major surface which portion is located in a space between two opposite edges of the sheet. The waveguide illumination system further includes a linear array of electrically interconnected side-emitting LED packages mounted to a major surface of the strip of heat-conducting printed circuit and optically coupled to the optically transmissive sheet within a light coupling area. A two-dimensional pattern of light extraction features is formed in at least one surface of the optically transmissive sheet such that a density of the light extraction features within the two-dimensional pattern increases with a distance from the light coupling area.