The optical apparatus includes a lens barrel, a lens held by the lens barrel, and a light emitter and an accessory attachment portion that are provided in an object-side end portion of the lens barrel so as to be located outside further than the lens in a radial direction of the lens barrel, the light emitter emitting an illumination light, the accessory attachment portion allowing detachable attachment of an accessory. The accessory attachment portion is located inside further than the light emitter in the radial direction. The lens barrel is provided with a slope surface formed so as to decrease an outer diameter of the lens barrel toward an object side end of the lens barrel.

A lightguide functioning as a luminaire. The luminaire includes at least one solid state light source, such as an LED, and a lightguide configured to receive light from the solid state light source. Light from the light source is coupled into the lightguide and transported within it by total internal reflection until the light exits the lightguide. A shape of the lightguide causes and directs extraction of the light, and can also be used to create a particular pattern of the extracted light. Such shapes include linear wedges and twisted wedges. Optical films can be included on the light input and output surfaces of the lightguide.

A display device includes a display panel including a display area and a non-display area adjacent to the display area, a bottom member including a bottom part facing the display area, a side part extending from the bottom part toward the display panel, and a support part extending from the side part to face a portion of the display area and the non-display area, a plurality of light sources on the bottom part to the display light, and a light guide member between the support part of the bottom member and the display panel to guide the light incident from the plurality of light sources toward the display panel.

The display device includes a liquid crystal panel having pixels, and an imaging device arranged on a backside of the liquid crystal display panel, wherein in an imaging area of the liquid crystal display panel overlapping the imaging device, the pixels are controlled so that black display pixels and white display pixels are alternately lined up in a row direction according to an operation of the imaging device.

An optical assembly for optical aperture expansion combines facet reflective technology with diffractive technology. At least two diffractive components having opposite optical power (matching) are used, so that chromatic dispersion introduced by the first diffractive component will then be cancelled by the second diffractive component. The two diffractive components are used in combination with a reflective optical component to achieve more efficient aperture expansion (for near eye display), reducing distortions and noise, while also reducing design constraints on the system and individual components, as compared to conventional techniques. The assembly eliminates and/or reduces the need for polarization management, while enabling wider field of view. In addition, embodiments can have reduced nonuniformity, as compared to conventional single technology implementations, since the distortion patterns of the two technologies do not correlate.

An automobile comprises a light transmitting film with a thickness not greater than 0.5 millimeters with a core layer, a lightguide region of the film comprises a light emitting region with light extracting features positioned to receive and extract light from at least one light source propagating by total internal reflection within the core layer out of the core layer, and a light mixing region positioned between the at least one light source and the light emitting region, wherein a surface of the portion of the automobile is visible through the light emitting region of the film when the at least one light source is not emitting light and the light transmitting film is conformal with the surface of the portion of the automobile. The surface of the film may have arcuate cross-sectional shape conforming to a curved surface of the portion of the automobile.

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.

According to an aspect of the disclosure, an illumination device includes: a first sheet including a first light entering main surface, a first light emission main surface, two first light blocking portions disposed at an interval in a first direction, and a first light-transmitting portion disposed between the two first light blocking portions; a second sheet including a second light entering main surface facing the first light emission main surface, a second light emission main surface, and a first lens; and a third sheet including a third light entering main surface facing the second light emission main surface, a third light emission main surface, two second light blocking portions disposed at an interval in the first direction, and a second light-transmitting portion disposed between the two second light blocking portions.

The invention is notably directed to a transflective display device. The device comprises a set of pixels, wherein each of the pixels comprises a portion of bi-stable, phase change material, hereafter a PCM portion, having at least two reversibly switchable states, in which it has two different values of refractive index and/or optical absorption. The device further comprises one or more spacers, optically transmissive, and extending under PCM portions of the set of pixels. One or more reflectors extend under the one or more spacers. An energization structure is in thermal or electrical communication with the PCM portions, via the one or more spacers. Moreover, a display controller is configured to selectively energize, via the energization structure, PCM portions of the pixels, so as to reversibly switch a state of a PCM portion of any of the pixels from one of its reversibly switchable states to the other. A backlight unit is furthermore configured, in the device, to allow illumination of the PCM portions through the one or more spacers. The backlight unit is controlled by a backlight unit controller, which is configured for modulating one or more physical properties of light emitted from the backlight unit. The invention is further directed to related devices and methods of operation.

A lighting fixture appears as a skylight and is referred to as a skylight fixture. First and second light engines of the fixture provide different color points, peak light intensity angles, far-field light distribution characteristics, and/or circadian stimulus values. A skylight fixture may include a sky-resembling assembly and a plurality of sun-resembling assemblies, with dedicated optical assemblies and/or light sources. A lighting fixture may include multiple waveguides that different extraction feature patterns and/or may be sequentially arranged.