An imaging directional backlight apparatus including a waveguide, a light source array, for providing large area directed illumination from localized light sources. The waveguide may include a stepped structure, in which the steps may further include extraction features optically hidden to guided light, propagating in a first forward direction. Returning light propagating in a second backward direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. The directional backlight may be arranged to switch between at least a first wide angular luminance profile mode and a second narrow angular luminance profile mode. The directional backlight is arranged to illuminate an LCD with a bias electrode arranged to switch liquid crystal directors in black state pixels between a first wide angular contrast profile mode and a second narrow angular contrast profile mode. Performance of privacy operation for off-axis snoopers is enhanced in comparison to displays with only directional backlights or switchable contrast properties.

The present invention provides a light-guiding plate which is applicable to incident rays over a wide ray angular range and wide wavelength rage, and is able to suppress a decrease in optical efficiency. A light-guiding plate 200 having a light diffracting portion 1200 for diffracting incident light by a multiple-recorded hologram is configured such that, in the light diffracting portion, when light 1210 of a single wavelength having a certain angular range is incident, at least two or more outgoing rays 1220 are discretely emitted with a first angular space θs, and the emitted rays each have a second angular range θa, and the first angular space θs is equal to or larger than the second angular range θa.

By rotating each optical member including an image display apparatus by a rotation unit, it is possible to change an aspect ratio and display an image. At this time, the rotation unit rotates a stop having an opening with a shape corresponding to the shape of an emission surface of image light in a video display element which is a video element of the image display apparatus along with the image display apparatus. Accordingly, even when an image with a horizontally long aspect ratio is shown and even when an image with a vertically long aspect ratio is shown, occurrence of stray light can be suppressed. Thus, guiding of the image light by a light-guiding optical system can be maintained in a good state, and thus good image display can be realized.

A camera device having an enlarged or wide-angle field of view generates images of surroundings simultaneously using only one image capturing unit, such as an image sensor, for example. The camera device uses a diverting unit disposed upstream of the image capturing unit. The diverting unit includes so-called holographic optical elements which, based on their deflection structures, divert or deflect light so that the camera device can capture the wide-angle field of view, without generating imaging aberrations on the resulting image(s). The deflection structures are wavelength-selective and/or angle-selective. The total field of view is subdivided into individual angle-of-incidence regions by virtue of the properties of the deflection structures.

A light projection system includes an angle-dependent pattern projection device projecting light of multiple patterns into corresponding multiple directions, and a waveguide comprising an input and an output, configured to accept the light from the angle-dependent pattern projection device and emit the light through the output, whereby the light from each of the multiple patterns takes a unique path through the waveguide. The waveguide is built into a headset display device, and the output of the waveguide couples light emitted through the output to an eye.

Embodiments of the present disclosure provides a transparent liquid crystal display device and a display method thereof. The transparent liquid crystal display device includes a transparent liquid crystal display panel and a transparent backlight module, the transparent liquid crystal display panel includes a color filter substrate, the transparent backlight module is disposed on a non-display side of the transparent liquid crystal display panel and includes a transparent light guide plate and an ultraviolet light source, the ultraviolet light source is disposed on a side end of the transparent light guide plate, the color filter substrate includes color resin lasers with different colors, and the color resin layers with different colors are mixed with fluorescent materials which are excitable to emit corresponding colors.

A ceiling fan is provided. The ceiling fan includes one or more fan blades. The ceiling fan further includes a motor. The motor is operatively coupled to the one or more fan blades. The motor is configured to drive rotation of the one or more fan blades. The ceiling fan further includes a light kit. The light kit includes a panel. The panel has an edge extending between a top surface of the panel and a bottom surface of the panel. The light kit further includes at least one light source positioned to illuminate the edge.

A head-mounted display includes a first display portion, a second display portion, and a support portion. The first display portion is capable of presenting an image to an eye of a user. The second display portion is capable of presenting an image to the other eye of the user. The support portion has a band member and a first communication member. The band member connects the first display portion and the second display portion with each other and is curved to be disposed around a head portion of the user. The first communication member is disposed in the band member and electrically connects the first display portion and the second display portion.

A display apparatus and an electronic device are described. The display apparatus includes a display component configured to output displaying light corresponding to a first image and a light path converting component configured to perform light path conversion on the displaying light. The light path converting component unit includes a collimating unit and a waveguide unit. The collimating unit is configured to collimate the displaying light into collimated light, and lead the collimated light into the waveguide unit. The waveguide unit is configured to exit the collimated light to form a virtual image at a predetermined position, with a size of the virtual image being greater than a display size of the display component. An image acquiring component is configured to receive photographing light from external side of the display apparatus via at least part of the waveguide unit to obtain a second image corresponding to the photographing light.

A back light module and a liquid crystal display apparatus are provided A back light module has a conductive frame, connected electrically to a reference voltage input terminal; a sealant frame displaced inside the conductive frame, wherein the sealant frame has a bottom surface adhered to a top surface of the conductive frame; a support structure displaced above the top surface of the conductive frame along the inside edges of the sealant frame; and a plurality of optical films disposed over the conductive film and being supported by the support structure. The plurality of optical films includes an upper brightness enhancement film, a lower brightness enhancement film, a diffuser film, a light guide plate; and a reflector film.