An attenuation device for blue light includes a base and a blue light attenuating film system, the blue light attenuating film system including a film layer of first refractive index and a film layer of second refractive index alternately disposed on the same side of the base, a total number of the film layer of first refractive index and the film layer of second refractive index being 5 at least; wherein a film layer closest to the base and a film layer farthest from the base in the blue light attenuating film system are both the film layer of first refractive index, and the film layer of first refractive index has a refractive index greater than that of the film layer of second refractive index. A display device and a wearable product, as well as a preparation method of the attenuation device for blue light are further provided.

Provided is an image display device with a see-through type display capable of inhibiting the reduction of the visibility of a background seen through a screen due to light emission from bright spots resulting from scratches and stains on a light guiding plate. In this image display device, a liquid crystal panel 30, a light guiding plate 45 with a light source 40 attached thereto, and a transparent plate 20 are disposed, from the display surface (front) side to the rear side, so as to be parallel to one another, and therefore, the surface of the light guiding plate 45 is inhibited from being scratched or stained by the transparent plate 20. Thus, the visibility of the image display device 100 is prevented from being reduced by bright spots.

Augmented reality glasses include a left eye lens part and a right eye lens part, each of the left eye lens part and the right eye lens part having a display area configured to display an augmented reality image, and a tracking area surrounding the display area, the tracking area including a plurality of light emission parts configured to emit light having a wavelength in an infrared band, and a frame including a left eye lens support area, a right eye lens support area, and a nose bridge connecting the left lens support area and the right lens support area, the left eye lens support area supporting the left eye lens part, and the right eye lens support area supporting the right eye lens part.

An illuminating unit includes a light-guiding section including a plurality of light-guiding plates, in which the light-guiding plates are stacked in a thickness direction and each have a light entrance section and a light output surface, a plurality of light sources that output light toward the light entrance sections of the respective light-guiding plates of the light-guiding section, and a substrate that supports the plurality of light sources and on which a circuit section is disposed, in which the circuit section drives each of the light sources. A first portion, on which the circuit section is disposed, of the substrate is disposed in opposition to a back surface of the light-guiding section.

A beam separator has a composite prism having an external input face and an external output face co-planar to the input face. At least one polarization beam splitter surface is encased within the composite prism and has an edge that defines a boundary between the external input face and the external output face. A first reflective surface is disposed to redirect, along a direction orthogonal to the input face, light of a first polarization that reflects from the at least one polarization beam splitter.

A pupil expander spatially modulates decoupling efficiency of light for pupil steering. The pupil expander can be used in a waveguide display, such as part of an artificial-reality display, to reduce power consumption of an optical source.

Provided is a backlight unit including a light source, an encapsulation layer, and a green quantum dot film. The light source emits a blue light. The encapsulation layer encapsulates the light source. The encapsulation layer includes red phosphors and yellow phosphors. The green quantum dot film is disposed above the light source and the encapsulation layer. The blue light is transmitted through the encapsulation layer and the green quantum dot film to generate a white light. A display device including the said backlight unit is also provided.

An emblem for a vehicle comprises: (a) a light source configured to emit visible light; (b) a cover assembly disposed over the light source, the cover assembly having an inner surface, an outer surface, and a transparent portion that is transparent to the visible light, the visible light being incident to the inner surface, and the visible light that the light source emits transmitting through the transparent portion out of the outer surface to an external environment beyond the emblem; and (c) one or more surface relief patterns disposed on the cover assembly, the one or more surface relief patterns configured to manipulate (i) the visible light that the light source emits, (ii) visible light from the external environment, or (iii) both (i) and (ii).

The invention relates to a handheld device and method for determining a status of a plant. The device includes a multi pixel digital colour sensor, a light source arranged for providing broadband illumination, wherein the light source and the multi pixel digital colour sensor are arranged in substantially the same plane, a light guide for guiding the light from said light source into the direction of the multi pixel digital colour sensor, a sample space, provided between the multi pixel digital colour sensor and the light source, for insertion of at least a part of the plant therein, and a processing unit configured for controlling at least the multi pixel digital colour sensor and the light source.

Lighting device (22) for a false ceiling (10) comprising a plurality of T-profiles (14) having respective longitudinal axes (A) and arranged in a square mesh grid (12), in which each T-profile (14) has a lower wall with a width (W) and in which the grid (12) has a center distance (D) between the longitudinal axes (A) of T-profiles (14) parallel and adjacent to one another, in which the lighting device (22) has an elongated parallelepiped shape with a width (W′) comparable to the width (W) of said T-profiles (14), a height (h) of less than 15 mm and a length (D′) comparable to said center distance (D) between the longitudinal axes (A) of T-profiles (14) parallel and adjacent to one another, and in which said lighting device (22) is capable of being fitted directly in contact with the lower wall of a respective T-profile (14).