Abstract: A head-up display for a vehicle comprises a spatial light modulator arranged to form a spatially modulated wavefront, and an optical sub-system arranged to direct the spatially modulated wavefront to an eye-box. The optical sub-system comprises an optical component having an external surface arranged to output the spatially modulated wavefront to the eye-box. At least part of the external surface of the optical component comprises a superhydrophobic surface structure, such as hierarchical micro-nanostructures.

Abstract: A picture generating unit comprises a display device arranged to display a hologram of a picture; and spatially modulate light in accordance with the displayed hologram to form a holographic reconstruction of the picture on a replay plane. The holographic reconstruction comprises a picture area and a non-picture area. The picture generating unit comprises an active mask in or downstream of the replay plane, the mask comprising a propagation area arranged to allow propagation of light along a projection axis, and a non-propagation area arranged to prevent propagation of light parallel to the projection axis. The propagation area and the non-propagation area share a boundary adjustable to change one or more physical parameters of the propagation area. The picture generating unit further comprises a drive means arranged to adjust the boundary to change the one or more physical parameters of the propagation area.

Abstract: A head-up display system includes an eye-box having a first and second dimension, an image projector including a picture generating unit and an optical system, and a movement assembly. The picture generating unit includes a spatial light modulator arranged to spatially modulate light in accordance with a hologram. The optical system relays the spatially modulated light to an optical combiner. The movement assembly moves at least a portion of the image projector rectilinearly between a plurality of positions such that at least one component of the picture generating unit is moved together with the optical system. Spatially modulated light relayed to the optical combiner forms a virtual image viewable from a sub-eye-box having a position in the first dimension being dependent on the position of the at least a portion of the image projector. The eye-box is the sum of the sub-eye-boxes associated with each of the plurality of positions.

Abstract: A head-up display arranged to form a virtual image viewable from an eye-box area. The head-up display is arranged to received picture content within a sub-region of a substantially quadrilateral display area. The head-up display further comprises an optical relay system arranged to relay the received picture content to an eye-box of the head-up display such that a virtual image of the picture content is visible therefrom. The optical relay system comprises at least one optical component shaped in correspondence with the shape of the sub-region. The shape of the eye-box area is non-rectangular such as a corner-cropped rectangular shape or elliptical shape.

Abstract: A head-up display arranged to form a virtual image viewable from an eye-box area. The head-up display is arranged to received picture content within a sub-region of a substantially quadrilateral display area. The head-up display further comprises an optical relay system arranged to relay the received picture content to an eye-box of the head-up display such that a virtual image of the picture content is visible therefrom. The optical relay system comprises at least one optical component shaped in correspondence with the shape of the sub-region. The shape of the eye-box area is non-rectangular such as a corner-cropped rectangular shape or elliptical shape.

Abstract: A system includes a switch-mode power supply for drawing low and constant current from a power source. The switch-mode power supply may charge an energy storage element with low and constant current. In a normal condition, a current driver may cause the illuminator to emit electromagnetic radiation as a plurality of flashes. In the normal condition, the system may include an average power that is less than or equal to a threshold value associated with the illuminator. In a fault condition, the illuminator may continuously emit electromagnetic radiation, at low current. In the fault condition, the switch-mode power supply may supply low and constant current to the illuminator. Similarly, in the fault condition, the system may include an average power that is less than or equal to a threshold value associated with the illuminator.

Abstract: A system includes a switch-mode power supply for drawing low and constant current from a power source. The switch-mode power supply may charge an energy storage element with low and constant current. In a normal condition, a current driver may cause the illuminator to emit electromagnetic radiation as a plurality of flashes. In the normal condition, the system may include an average power that is less than or equal to a threshold value associated with the illuminator. In a fault condition, the illuminator may continuously emit electromagnetic radiation, at low current. In the fault condition, the switch-mode power supply may supply low and constant current to the illuminator. Similarly, in the fault condition, the system may include an average power that is less than or equal to a threshold value associated with the illuminator.