A light guide module and an augmented reality (AR) apparatus are disclosed. The AR apparatus includes a display module and the light guide module. The light guide module includes a first light guide plate and a second light guide plate. The first light guide plate has a light receiving area for receiving optical input light with a predetermined incident angle and a light outputting area for outputting optical input light. The second light guide plate is disposed on the first light guide plate, and has dichroic surfaces for selectively transmitting or reflecting the optical input light.

Examples are disclosed that relate to the coupling of light into a light guide for a backlight system. One disclosed example provides a flat-panel illuminator comprising a concentrating reflector, a light guide, and one or more light emitters. The concentrating reflector includes a curved reflective portion, a light guide including a planar face and an input edge positioned adjacent the concentrating reflector, and the one or more light emitters are arranged within the concentrating reflector and spaced from the input edge of the light guide.

A display device includes a light-emitting module and a light-diffusing sheet stacked body. The light-emitting module includes at least one light guide plate including an upper surface and a lower surface, and light sources disposed at the lower surface side of the light guide plate. The light-diffusing sheet stacked body includes a first light-diffusing sheet disposed on the light guide plate, a second light-diffusing sheet disposed on the first light-diffusing sheet, and a third light-diffusing sheet disposed on the second light-diffusing sheet. The first light-diffusing sheet includes first protrusions at an upper surface side thereof. The second light-diffusing sheet includes second protrusions at an upper surface side thereof. The third light-diffusing sheet includes third protrusions at an upper surface side thereof. A shape of the third protrusion may be different from a shape of the first protrusions and/or a shape of the second protrusions.

Techniques disclosed herein relate generally to surface-relief structures. In one embodiment, a surface-relief grating includes a plurality of grating ridges. The plurality of grating ridges includes a first set of grating ridges characterized by a first refractive index, and a second set of grating ridges interleaved with the first set of grating ridges and characterized by a second refractive index different from the first refractive index. The plurality of grating ridges is imprinted in a polymer layer by a nanoimprint lithography process and is exposed to a light pattern to form the first set of grating ridges and the second set of grating ridges that have different refractive indices.

An object of the present invention is to provide a light source lens that makes it possible to improve unevenness in a luminance distribution, an illumination unit, and a display unit.

A light source lens (1) according to the present disclosure includes an incident surface on which light from a light-emitting device is incident, and an exit surface (20) that has a diffusing function at a center part (21) for light incident through the incident surface as well as a light-condensing function at at least a portion of an intermediate part (22) and a peripheral part (23) for the light incident through the incident surface.

According to one embodiment, an electronic device includes a liquid crystal panel and an illumination device. The illumination device includes a first light guide having a first opening and facing the liquid crystal panel, a first light source facing the first light guide, a second light guide provided in the first opening and having a first main surface facing the liquid crystal panel, a second main surface, and a side surface, a second light source having a light emitting surface facing the side surface, and a wavelength conversion element located between the side surface and the light emitting surface, and configured to convert a wavelength of light from the second light source.

Embodiments of the present disclosure provide an image display device and a wearable apparatus. The image display device includes a waveguide assembly and a light-emitting unit. The light-emitting unit is configured to emit a light signal. The light signal is transmitted through the waveguide assembly and forms an emergent light signal. A center of the emergent light signal deviates from a center of a viewing angle of a user.

A light-emitting module includes a light-emitting element unit including a light-emitting element, a light-transmissive member covering a main light-emitting surface of the light-emitting element, and a first light-reflective member covering lateral surfaces of the light-emitting element; a light-transmissive light-guiding plate having a first main surface and a second main surface having a recess accommodating the light-emitting element unit; a second light-reflective member covering the second main surface and the light-emitting element unit; and a light-transmissive bonding member disposed in contact with inner lateral surfaces of the recess and outer lateral surfaces of the light-emitting element unit. At least a portion of the first light-reflective member is located outside the recess in a cross-sectional view, and is in contact with the light-transmissive bonding member. The light-transmissive bonding member has an inclined surface forming an acute angle with a corresponding outer lateral surface of the first light-reflective member.

A backlight comprises a plurality of light sources mounted on a mounting substrate in rows; lenses respectively arranged on the light sources; and a reflective sheet disposed on the mounting substrate and provided with through-holes through which the light sources protrude, wherein a first light source spacing of the plurality of light sources in a row direction is set to Px, an inter-row spacing of the plurality of light sources in other direction orthogonal to the row direction is set to Py, a first maximum length of each of the through-holes in the reflective sheet in the row direction is set to a, an inter-row maximum length of each of the through-holes in the reflective sheet in the other direction is set to b, the reflectivity of the reflective sheet is set to α and the reflectivity of the mounting substrate is set to β, the following mathematical formula 1 is satisfied if Py>Px:

[00001]$\frac{\alpha \left(\mathrm{Px}-a\right)+\beta a}{\alpha \left(\mathrm{Py}-b\right)+\beta b}.Math.\frac{\mathrm{Py}}{\mathrm{Px}}>0.9.$

An optical structure includes a high refractive-index layer and a low refractive-index layer laminated on the high refractive-index layer and having a refractive index lower than that of the high refractive-index layer, and is disposed on a display surface of a display device. An interface between the layers has a concave-and-convex shape, and each of a concavity and a convexity in the shape has a flat portion extending in a surface direction of the layers. A side surface of the concave-and-convex shape, which extends between the flat portions of the concavity and convexity, is a curved surface or a folded surface that is convex to the low refractive-index layer. A difference between a maximum angle and a minimum angle, which are defined between the side surface of the concave-and-convex shape and a normal direction of the layers, is not less than 3 degrees and not more than 60 degrees.