Abstract:
A light emitting device is provided, comprising a light guide plate (100) and at least one light emitting diode (110). An array of mutually spaced apart reflective surface elements (103, 103') is arranged between said back surface (102) and said front surface (103). The reflective surface elements (103, 103') are non-parallel relative to said back surface (101) and front surface (102), and have a front side (104) facing said front surface (102) and a back side (105) facing said back surface (101). The back surface (105) of a reflective surface element (103) faces the front surface (104) of an adjacent reflective surface element (103'). The at least one light emitting diode (110) is arranged to emit light into a region (111) between two adjacent ones of said reflective surface elements (103, 103'). Since the reflective surface elements are located within the light guide, both the back surface and the front surface of the light guide plate may be made flat. This flat surface may easily be kept clean from dust and dirt.
Abstract:
An optical system includes a light-transmitting substrate having at least two external major surfaces and edges and an optical element for coupling light waves into the substrate, by total internal reflection. At least one partially reflecting surface is located in the substrate for coupling light waves out of the substrate, and at least one transparent layer, having a refractive index substantially lower than the refractive index of the light transmitting substrate is optically attached to at least one of the major surfaces of the substrate, defining an interface plane. The light waves coupled inside the substrate are substantially totally reflected from the interface plane between the major surface of the substrate and the transparent layer.
Abstract:
In various embodiments, an illumination apparatus features spatially separated input and output regions, a light source, a phosphor for light conversion, and an out-coupling structure.
Abstract:
A light emitting device is provided, comprising a light guide plate (100) and at least one light emitting diode (110). An array of mutually spaced apart reflective surface elements (103, 103') is arranged between said back surface (102) and said front surface (103). The reflective surface elements (103, 103') are non-parallel relative to said back surface (101) and front surface (102), and have a front side (104) facing said front surface (102) and a back side (105) facing said back surface (101). The back surface (105) of a reflective surface element (103) faces the front surface (104) of an adjacent reflective surface element (103'). The at least one light emitting diode (110) is arranged to emit light into a region (111) between two adjacent ones of said reflective surface elements (103, 103'). Since the reflective surface elements are located within the light guide, both the back surface and the front surface of the light guide plate may be made flat. This flat surface may easily be kept clean from dust and dirt.
Abstract:
Materials and lightguides formed thereof that are suitable for use in lighting units to impart a color filtering effect to visible light. At least a portion of such a lightguide(16) is formed of a composite material comprising a polymeric matrix material and an inorganic particulate material that contributes a color filtering effect to visible light passing through the composite material, and the particulate material comprises a neodymium compound containing Nd 3+ ions.
Abstract:
A lighting system can comprise an edgelit panel, for example a lightguide that may have a panel or slab shape with an edge that receives light from an array of light emitting diodes extending along the edge. The lightguide can guide the received light towards an opposing edge of the lightguide and gradually release light to provide illumination. An optic can manage light that reaches the opposing edge of the lightguide, for example via softening, spreading, concentrating, or diffusing the light. The optic can be mounted to or integrated in the opposing edge of the lightguide.
Abstract:
An optical apparatus for a head wearable display includes a lightguide, in-coupling holograms, and an out-coupling optical element. The lightguide includes an in-coupling region for receiving display light into the lightguide, an out-coupling region for emitting the display light out of the lightguide, and a relay region for guiding a path of the display light from the in-coupling region to the out-coupling region. A first of the in-coupling holograms is disposed at the in-coupling region to redirect the path of the display light by a first angle. A second of the in-coupling holograms is disposed across from the first in-coupling hologram at the in-coupling region to redirect the path of the display light by a second angle such that the path of the display light enters a total internal reflection condition in the relay region after redirection by the first and second in-coupling holograms.