An illumination system comprises a lightguide (12) having a plurality of light extraction features (LEFs); and a plurality of independently controllable light sources (11a, 11b, 11c). The LEFs have a preferred direction, with light that is incident on an LEF along the preferred direction of the LEF being extracted from the lightguide generally parallel to a reference plane, and light that is incident on an LEF not along the preferred direction of the LEF being extracted from the lightguide at an extraction angle to the reference plane, the extraction angle being related by a response function to an incidence angle between the light propagation direction and the preferred direction of LEF. The shape of the LEFs varies with distance from a reference point or respective reference point so that the response function becomes larger with increasing distance of the LEFs from the reference point.

In an example embodiment, a cross runner of a suspended ceiling grid is provided, wherein the cross runner may comprise a light fixture configured to function as a cross runner, and the light fixture may comprise a light guide.

A uniform bezel display uses off-axis illumination from within a rear cavity to direct light into a backlight that distributes the light to a liquid crystal display panel. A light source, such as plural LEDs interfaced with a circuit board, is disposed on a beveled surface formed in the cavity and aligned to direct light into a reflective surface of the backlight interior. Offset placement of the light source in a cavity of the display housing reduces the footprint of the light source at the side of the housing perimeter so that a uniform width bezel will cover the LCD panel around the housing perimeter.

Light-emitting devices for motor vehicles are provided, which comprise a reflection hologram. A light-guiding body is provided to direct light from a light source arrangement (4) onto the hologram.

An optical device includes a lightguide having a first pair of external surfaces parallel to each other, and at least two sets of facets. Each of the sets including a plurality of partially reflecting facets parallel to each other, and between the first pair of external surfaces. In each of the sets of facets, the respective facets are at an oblique angle relative to the first pair of external surfaces, and at a non-parallel angle relative to another of the sets of facets. The optical device is particularly suited for optical aperture expansion.

The present invention is directed to an optical member including: a first layer that includes a first region having a refractive index n.sub.1 and a second region having a refractive index n.sub.3; and a second layer disposed on a first main surface of the first layer so as to be in contact with the first region and the second region, the second layer having a refractive index n.sub.2. The first layer includes a plurality of said second regions adjoining the first region along a planar direction of the first layer; the plurality of second regions constitute a geometric pattern; and n.sub.1 to n.sub.3 satisfy the relationship n1<n3<n2. When an optical member according to the present invention is integrated with a lightguide in use, excellent light extraction function is exhibited and leakage of light due to light scattering is suppressed, while attaining good mechanical strength at the same time.

A planar illumination apparatus according to an embodiment includes a plurality of light sources, a light guide plate, a wiring substrate, a light diffusion sheet, a fixing member and an optical sheet. The light guide plate has a light entrance end surface and two main surfaces and emits, from at least one of the two main surfaces, the light entering the light entrance end surface. The wiring substrate extends so as to cover the light entrance end surface. The light diffusion sheet is arranged in a direction perpendicular to the main surfaces, one end portion of the light diffusion. sheet running on the wiring substrate. The fixing member is arranged to cover the light diffusion sheet. The optical sheet is arranged between the light diffusion sheet and the fixing member. The light diffusion sheet includes a notch formed from the one end portion.

A display device 10 includes a display panel 11, a light source row 170, a light guide plate 16, a chassis 14 and a recess portion 134b that is fitted the chassis 14. The light guide plate 16 includes a positioning projection portion 160 that is fitted to the recess portion 134b. The positioning projection portion 160 projects outwardly from a side edge surface 16e of the light guide plate 16. The positioning projection portion 160 has a projection, and among rays of light emitted from an end light source 17X included in the light source row 170 and entering the light guide plate through a light entrance surface 16b, narrow-angle light L2 directed outward at an angle α (a critical angle θc) with respect to an optical axis L1 enters the projection. The positioning projection portion 160 includes a first edge surface 161 and a second edge surface 162. The first edge surface 161 is parallel to a side edge surface 16e and the narrow-angle light L2 reaches the first edge surface 161. The second edge surface 162 is between the side edge surface 16e and the first end surface 161 and is inclined such that an external angle β between the first edge surface 161 and the second edge surface 162 is equal to or smaller than the critical angle θc.

A static multiview display and method of static multiview display operation provide a static multiview image using diffractive gratings to diffractively scatter light from guided light beams having different radial directions provided by a horizontal diffuser. The static multiview display includes a light guide configured to guide the light beams; the horizontal diffuser configured to provide the guided light beams with the different radial directions using light from a directional light source; and a plurality of diffraction gratings configured to scatter out light from the guided light beam plurality as directional light beams representing the static multiview image. The method of static display operation includes providing and diffusing directional light to provide guided light beams having different radial directions, and further scattering out light from the guided light beam as directional light beams representing the static multiview image.

The present invention relates to the technical field of display, and discloses a light guide plate, a backlight source and a display apparatus, for solving the problem of the exit light non-uniformity of the backlight source. The light guide plate comprises a light guide plate main body and at least one boss, the light guide plate main body comprises a first light entrance surface, a first light exit surface intersecting with the first light entrance surface, and a first bottom surface opposed to the first light exit surface; the boss is located on the first light entrance surface and comprises a second bottom surface adjoining the first light entrance surface, a top surface opposed to the second bottom surface, as well as two end faces and two side surfaces respectively intersecting with the top surface and the second bottom surface at two ends, wherein the area of the top surface is less than that of the second bottom surface, the two end faces are respectively flush with the first bottom surface and the first light exit surface, and the two side surfaces are respectively slope surfaces which may be used as a second light entrance surface. The light guide plate mentioned by the present invention is used to improve the exit light uniformity of the backlight source.