Provided is a liquid crystal display device and a polarizing plate capable of improving the contrast ratio in the front direction. The polarizing plate includes a pair of polarizers including a first polarizer and a second polarizer whose transmission axes are parallel to each other; a retarder between the paired polarizers; and a diffusion layer in at least one of a region between the paired polarizers or a region on a side without the retarder of the first polarizer.

A switchable backlight for a switchable privacy display apparatus comprises a collimated waveguide and an optical turning film comprising first and second arrays of elongate prismatic elements. High image luminance and image visibility is provided for off-axis viewers in a public mode of operation while in a privacy mode of operation visual security level above a perceived privacy threshold may be achieved for off-axis snoopers.

The present disclosure relates to a composition including a light-emitting perovskite compound (1) which includes constituent components A, B, and X, and a silazane or modified product thereof (2).

The present disclosure relates to light redirecting elements in solar energy absorption systems and envisages a light redirecting prism, a redirecting prismatic wall and a solar panel incorporating the same. The light redirecting prism has three elongate surfaces. The incident surface receives incident parallel rays of light. The redirecting surface performs total internal reflection of the light travelling from the incident surface through a predetermined range of angles and thus redirect the light. The transmitting surface transmits the redirected light at a predetermined angle out of the prism and directs the light towards a solar energy absorbing device. Further, a redirecting prismatic wall can be constructed to comprise redirecting prisms. The light redirecting prism or redirecting prismatic wall can be used in solar panels for enhancing quantum of light incident on the PV cell of the panel.

A retroreflector structure with a plurality of cornercube prisms in a sheet and a projected aperture of at least one of the cornercube prisms has a concave polygon shape with at least one interior angle greater than 180°.

A semiconductor laser shaping device includes, along the light path of a semiconductor laser, a fast axis collimating lens, slow axis collimating lens, the half wave plate, a polarization beam combining prism, and a crawling prism group. The laser emitted by the semiconductor laser is collimated by a fast-axis collimating lens and then by a slow-axis collimating lens, and subsequently injected into a half wave plate and polarization beam combining prism, which compresses its spot size along the slow axis while keeping the spot size unchanged along the fast axis. The laser beam then passes through the crawling prism group, which shifts a portion of the light in the slow-axis direction to the fast-axis direction, which again compresses the light beam in the slow-axis direction. The device can reduce the beam size of a semiconductor laser in the slow-axis direction, reducing its beam parameter product and improving beam quality.

The present disclosure provides a display screen and a display device. The display screen includes a display panel, a cover plate, and a shielding layer disposed between the two. The display screen further includes a bonding layer disposed between the shielding layer and the display panel. The bonding layer includes a glue layer including a first side close to the display panel and a second side away from the display panel; and a light guiding portion including a light incident side configured to input ultraviolet light and a light-emitting side configured to output the ultraviolet light to the first side or the second side.

A vehicle lamp includes a light source including a plurality of light emitting elements or light emitting surfaces, a projection lens that projects light emitted from the light source, and a light distribution adjusting element that adjusts light distribution of the light emitted from the light source, wherein the light distribution adjusting element has a plurality of prisms having different angles of inclined surfaces corresponding to a direction in which the plurality of light emitting elements or light emitting surfaces are arranged, and prism surfaces in which at least one or a plurality of flat surfaces are arranged.

The present disclosure provides a dual reflective micro projection optical engine. The dual reflective micro projection optical engine includes a light source and a DMD chip, and a collimating light-combining module, a fly-eye lens, a diopter prism, a reflective mirror, a relay lens, a prism assembly, and a projection lens that are successively disposed in a light exit direction of the light source, wherein a light incident surface and a light exit surface of the diopter prism are planar surfaces.

A thin optical imaging module of a biometric apparatus includes a first glass substrate, a first optical prism film, a second optical prism film, and an image sensor. The first glass substrate further includes a fingerprint imaging area, a vein imaging area, a contact surface, a reflective interface, and an attaching surface. The first optical prism film adhered to the attaching surface is located under the fingerprint imaging area. The second optical prism film is adhered to a position under the first optical prism film. The image sensor disposed in correspondence to the first glass substrate is located under the attaching surface.