A lighting device according to an embodiment includes a sensor, a substrate disposed on the sensor and including an electrode pattern, a light source disposed on the substrate and electrically connected to the electrode pattern, a resin layer disposed on the substrate, and a reflective layer disposed between the substrate and the resin layer, and the substrate may include a first region overlapping the sensor in a first direction perpendicular to an upper surface of the substrate, a second region surrounding the first region, the light source may be disposed on the second region, the plurality of reflective pattern groups may be disposed on the first region, and the sensor may not overlap the light source and the electrode pattern in the first direction.

According to one embodiment, an illumination device, in which a plurality of light guides include a plurality of light guide pairs, each of the plurality of light guide pairs includes a first light guide and a second light guide, the plurality of light guide pairs are connected with their long sides opposed to each other, a plurality of laser light source elements include a plurality of first light source elements arranged to be opposed to a first side surface on a short side of the first light guide of the light guide pair, and a plurality of second light source elements arranged to be opposed to a second side surface of the second light guide of the light guide pair.

A head-mounted computing device having a waveguide optical engine assembly is disclosed. The waveguide is enclosed in a housing to limit or minimize exposure of the waveguide to ambient light. Further, the waveguide optical engine assembly comprises a compact footprint by allowing the other components of the waveguide optical engine assembly, such as a microprojector, a prism assembly, and the like, to be placed behind a rear surface of the waveguide. In addition to the compact footprint of the waveguide optical assembly, the configuration of the waveguide optical assembly disclosed, allows for maximization of advantages provided by the waveguide as related to eye box and eye relief. Additionally, the power requirements of the waveguide are greatly reduced, which also results in a prolonged battery life powering the head-mounted computing device.

A display panel and a display device are provided. The display panel has a touch side and includes an array substrate and an opposite substrate arranged opposite to each other. The array substrate includes an image sensor array including a plurality of image sensors each including a photosensitive element configured to receive light reflected by a texture touched on the touch side for texture acquisition; the opposite substrate includes a light shielding layer including a plurality of first openings arranged in an array, and the plurality of first openings are in one-to-one correspondence with and partially overlap with the photosensitive elements of the plurality of image sensors in a direction perpendicular to a panel surface of the display panel.

An image light guide for conveying a virtual image, including a waveguide, an in-coupling diffractive optic operable to direct image-bearing light beams into the waveguide, and an out-coupling diffractive optic operable to direct the image-bearing light beams from the waveguide toward an eyebox. The out-coupling diffractive optic having two or more zones each including a set of diffractive features, wherein successive zones along one dimension of the out-coupling diffractive optic have different respective sets of diffractive features, wherein the diffractive features are operable to direct image-bearing light beams of a first pixel incident upon the diffractive features at a first angle whereby the directed image-bearing light beams of the first pixel further propagate within the waveguide, and wherein the diffractive features are operable to out-couple a portion of the image-bearing light beams of the first pixel incident upon the diffractive features at a second angle.

An optical device includes a frame supporting a lightguide, a microdisplay, and a field lens positioned therebetween that directs light from the microdisplay into a top surface of the lightguide. Four optical surfaces of the lightguide include: a curved surface where light from the microdisplay enters a top of the lightguide, curved eye-side and world-side surfaces providing total internal reflection, and a combiner surface. The eye-side surface is used twice. Once in total internal reflection, and a second time as a refractive surface when light is reflected from the combiner surface and is thereby refracted out of the lightguide and directed towards a user's eye. The field lens has a curved first surface oriented toward the microdisplay and a curved second surface oriented toward the top of the lightguide. The combiner surface combines ambient light from a world-side of the lightguide with light from the microdisplay.

An optical device includes a liquid crystal layer having a first plurality of liquid crystal molecules arranged in a first pattern and a second plurality of liquid crystal molecules arranged in a second pattern. The first and the second pattern are separated from each other by a distance of about 20 nm and about 100 nm along a longitudinal or a transverse axis of the liquid crystal layer. The first and the second plurality of liquid crystal molecules are configured as first and second grating structures that can redirect light of visible or infrared wavelengths.

Display devices include waveguides with in-coupling optical elements that mitigate re-bounce of in-coupled light to improve overall in-coupling efficiency and/or uniformity. A waveguide receives light from a light source and/or projection optics and includes an in-coupling optical element that in-couples the received light to propagate by total internal reflection in a propagation direction within the waveguide. Once in-coupled into the waveguide the light may undergo re-bounce, in which the light reflects off a waveguide surface and, after the reflection, strikes the in-coupling optical element. Upon striking the in-coupling optical element, the light may be partially absorbed and/or out-coupled by the optical element, thereby effectively reducing the amount of in-coupled light propagating through the waveguide. The in-coupling optical element can be truncated or have reduced diffraction efficiency along the propagation direction to reduce the occurrence of light loss due to re-bounce of in-coupled light, resulting in less in-coupled light being prematurely out-coupled and/or absorbed during subsequent interactions with the in-coupling optical element.

An alarm indicator (4) is provided with a light guiding member (41), a first light source (42) and a transmissive member (43). The light guiding member (41) extends in a first direction that is parallel to a display screen in which medical information is displayed. The first light source (42) faces an end face (41a) of the light guiding member (41) in the first direction. The transmissive member (43) covers the light guiding member (41) from a second direction intersecting with the first direction. The light guiding member (41) is provided with a light reflecting portion and an outer face (41d). The light reflecting portion extends in the first direction and reflects the light incident from the end face (41a) at least toward the second direction intersecting with the first direction. The light reflected by the reflecting portion is emitted from the outer face (41d) while being diffused.

An alarm indicator (4) is provided with a light guiding member (41), a first light source (42) and a transmissive member (43). The light guiding member (41) extends in a first direction that is parallel to a display screen in which medical information is displayed. The first light source (42) faces an end face (41a) of the light guiding member (41) in the first direction. The transmissive member (43) covers the light guiding member (41) from a second direction intersecting with the first direction. The light guiding member (41) is provided with a light reflecting portion and an outer face (41d). The light reflecting portion extends in the first direction and reflects the light incident from the end face (41a) at least toward the second direction intersecting with the first direction. The light reflected by the reflecting portion is emitted from the outer face (41d) while being diffused.