A drive device comprises a drive unit, a source, a filter unit, and a determining unit.

An assembly (10) for generating a laser beam (12) includes a beam steering assembly (18); a laser assembly (16) that is tunable over a tunable range; and a controller (20). The laser assembly (16) generates a laser beam (12) that is directed at the beam steering assembly (18). The controller (20) dynamically controls the beam steering assembly (18) to dynamically steer the laser beam (12) as the laser assembly (16) is tuned over at least a portion of the tunable range. As a result thereof, the laser beam (12) is actively steered along a desired beam path (12A) while the wavelength of the laser beam (12) is varied.

A directivity backlight display device with reflector curvature assisted diffuser includes a light source module, a reflective narrow-angle diffuser, a concave reflector, and a backlit type display panel. The light source module projects a light. The reflective narrow-angle diffuser includes a concave surface or a flat surface served as a reflecting surface. The reflecting surface is provided with a plurality of micro curved mirrors laid out in an array. The light is reflected and diffused by the reflective narrow-angle diffuser and the concave reflector to provide a uniform directional light beam. A backlit type display panel is deployed to display an image. The uniform directional light beam penetrates the backlit type display panel to provide a directional image light beam, and then projects the directional image light beam to a projection area. With this arrangement, a reflective narrow-angle diffuser with a low concave curvature is deployed to achieve a high-directivity image projection.

A head up display apparatus for a vehicle includes an imaging unit that generates a projection light beam with display content and includes a transmissive display indication layer with selectively controllable display elements distributed over an area, a matrix backlight that provides backlighting therefor and includes selectively controllable light sources distributed along the transmissive display indication layer, and a collimation array with collimators arranged between a light source and the transmissive display indication layer, and a projection panel in the beam path of the projection light beam generated by the imaging unit for reflecting the projection light beam to a user, the projection panel being arranged in the beam path such that a virtual display image is generated therebehind in the visual field of the user.

A projection exposure apparatus for semiconductor lithography comprises an optical element and a temperature recording device for detecting a temperature on a surface of the optical element via electromagnetic radiation emanating from the surface of the optical element. The temperature recording device can comprise a filter for filtering the electromagnetic radiation.

Art exhibition device and a video picture exhibition method which are capable of providing renditions by a spatial image and a projected image, in combination are provided. The exhibition device includes a display portion configured to image-form a spatial image; and a projector configured to project a video picture onto an object. The video picture exhibit ion method using the exhibition device provides a video picture related to the spatial image projected from the projector disposed in a position hang over the display portion toward an upper surface of the display portion. The display portion is configured to image-form a video picture displayed on a display surface of a display disposed in an attitude inclined under a micromirror array through the micromirror array disposed in light-transmissive fashion as a spatial two-dimensional video picture standing up obliquely in a spatial position lying over the micromirror array.

Examples are disclosed that relate to mixed reality display devices. One example provides a head-mounted display device comprising, a display, a lens system, and a curved Fresnel combiner. The curved Fresnel combiner is configured to direct light received from the display via the lens system toward an eyebox, and is at least partially transmissive to background light.

Examples are disclosed that relate to mixed reality display devices. One example provides a head-mounted display device comprising, a display, a lens system, and a curved Fresnel combiner. The curved Fresnel combiner is configured to direct light received from the display via the lens system toward an eyebox, and is at least partially transmissive to background light.

A multi-aperture imaging device includes an image sensor, an array of optical channels, each optical channel including an optic for imaging a partial field of view of a total field of view onto an image sensor region of the image sensor, and a beam-deflector switchable between a first rotational position and a second rotational position by executing a switching movement, and configured to deflect, in a first rotational position, optical paths of the optical channels into a first viewing direction, and to deflect, in a second rotational position, the optical paths of the optical channels into a second viewing direction. The array is configured to execute, based on the switching movement, an adjustment movement for adjusting an orientation of the array with respect to the beam-deflector.

A lidar system includes one or more light sources configured to generate a first beam of light and a second beam of light, a scanner configured to scan the first and second beams of light across a field of regard of the lidar system, and a receiver configured to detect the first beam of light and the second beam of light scattered by one or more remote targets. The scanner includes a rotatable polygon mirror that includes multiple reflective surfaces angularly offset from one another along a periphery of the polygon mirror, the reflective surfaces configured to reflect the first and second beams of light to produce a series of scan lines as the polygon mirror rotates. The scanner also includes a pivotable scan mirror configured to (i) reflect the first and second beams of light and (ii) pivot to distribute the scan lines across the field of regard.