An example a head-mounted display device includes a light projector and an eyepiece. The eyepiece is arranged to receive light from the light projector and direct the light to a user during use of the wearable display system. The eyepiece includes a waveguide having an edge positioned to receive light from the display light source module and couple the light into the waveguide. The waveguide includes a first surface and a second surface opposite the first surface. The waveguide includes several different regions, each having different grating structures configured to diffract light according to different sets of grating vectors.

An optical member includes a light source, a first substrate to be a light guide that guides emitted light from the light source, a variable layer in contact with a predetermined surface of the first substrate, and a second substrate facing the first substrate via the variable layer. When a refractive index of the first substrate is n1, a refractive index of the variable layer can be changed to n2 or n3 (where n2>n3), and n1, n2, and n3 satisfy a relationship of |n1−n2|<|n1−n3|.

Disclosed herein are safety devices that are positioned on the end of a fiberoptic cable, such as those used in surgical procedures, to prevent patients and other objects from the risk of burn from light or heat emitted from the end of the cable when not connected to an optical instrument. The disclosed safety devices can be added to the ends of existing cables and/or can be included at the end of cables during manufacture. In some embodiments, the safety device replaces an existing connector at the end of a cable, and in some embodiments the safety device is added in addition to a connector at the end of the cable. In some embodiments, a slit end cover is included over an open end of an adaptor that is mounted on a distal connector of a fiberoptic cable.

A light distribution structure 10 and a related element 100, such as a light guide, are provided. The structure 10 is preferably an optically functional layer comprising an at least one feature pattern 11, 11A established in a light-transmitting carrier by a plurality of three-dimensional optical features variable in terms of at least one of the cross-sectional profile, dimensions, periodicity, orientation and disposition thereof within the feature pattern. In some instances, the optical features are embodied as internal optical cavities 12 capable to establish the total internal reflection (TIR) function at a horizontal surface and at an essentially vertical surface thereof. A method for manufacturing the light distribution structure is further provided.

A display apparatus including a display panel, a light source unit configured to provide light to the display panel, and a light guide member disposed between the display panel and the light source unit and covering the light source unit such that the light source unit is buried in the light guide member, the light guide member having a surface roughness on an upper surface thereof to diffuse light and including a substrate, and a light emitting device disposed on the substrate and including a blocking pattern to have an intensity of light emitted in an upward direction to be equal to or less than about 80% of a maximum light intensity of the light emitting device.

A light guide plate according to one or more embodiments may include a plurality of optical path changing units each converging incident light to a definite point. A stereoscopic image is formed in a space by a collection of a plurality of definite points. The stereoscopic image includes a plurality of faces not parallel to each other, the face is made up of a plurality of dots dispersedly arranged on the face, and a density of the plurality of dots on each of the faces is a value corresponding to a position of the face.

The invention relates to a function display (1) for selectively displaying several symbols representing one switching function, respectively, and/or at least two switching states, respectively, comprising: a light guide stack which, given an attachment of the function display (1) as intended, forms a display surface (8) facing towards the observer (B); wherein the light guide stack is formed from at least two transparent or translucent, planar light guides (2, 3) arranged in an overlaid manner in a stacking direction, which are arranged so as to be spaced apart by a transparent or translucent layer consisting of a material that is optically thinner compared to the adjacent light guides (2, 3), preferably an air gap (14), so that the light guides (2, 3) each have a main surface (H) facing towards the observer (B) and a main surface (H′) facing away from the observer (B), and, in at least one light guide (2), the main surface (H′) facing away from the observer (B) faces towards a light guide (3) which is most closely adjacent in the opposite direction to the stacking direction;

at least one light source (5, 5′) per light guide (2, 3), which is arranged such that in each case, its light (L, L′), via an end face (11) of an associated light guide (2, 3) facing towards the light source (5, 5′), is coupled into the respective light guide (2, 3); wherein, further, at least one microstructured symbol area (12a, 12b) provided in or on the light guide (2, 3) is provided for each light guide (2, 3), which is configured, if the light source (5, 5′) is respectively activated, to be visible, illuminated by the light (L, L′) coupled into the light guide (2, 3), to the observer (B); a circuit board (7) on which the several light sources (5, 5′) are arranged and fixed; a panel (6) fixed to the light guide stack by substance-to-substance connection and/or non-positively and/or positively, to which the circuit board (7) is fixed while resting against a mounting surface (15), wherein two light sources (5′) of the circuit board serve as an alignment aid in attaching the circuit board (7) and the panel (6); and an associated assembly method.

A mobile augmented reality near to eye display having one of a single chip programmed, configured, or adapted to permit user selective field of view and a variable resolution image projection, or a single image guide adapted to multiplexed full color image transfer to achieve full color, 90 degrees FOV, and retinal image resolution.

A waveguide display assembly comprises a waveguide, including an in-coupling grating configured to in-couple light of a first wavelength band emitted by a light source into the waveguide, and cause propagation of the light of the first wavelength band through the waveguide via total internal reflection. An out-coupling grating is configured to out-couple the light of the first wavelength band from the waveguide and toward a user eye. One or more diffractive gratings are disposed along an optical path between the in-coupling grating and the out-coupling grating, the one or more diffractive gratings configured to diffract light outside the first wavelength band out of the waveguide and away from the user eye.

A lighting device includes light sources arranged in an arrangement direction, a first light guide plate, and a second light guide plate on the first light guide plate. The first light guide plate includes a first light entering surface, a first light exit surface, and a first light diffusion portion adding a diffusion action to light to be refracted and travel in a crossing direction crossing the arrangement direction. The second light guide plate includes a second light entering surface, a second light exit surface, and a second light diffusion portion adding a diffusion action to light to be refracted and travel in the arrangement direction seen from the normal direction of the second light exit surface. The second light diffusion portion includes first lenses that include ridgelines extending in the crossing direction and inclined portions inclined at an angle from 35° to 55° inclusive relative to the normal direction.