Display for reducing speckle

摘要

There is provided display comprising a diffuser, projector and driver. The diffuser comprises a liquid crystal operable in a light scattering mode in which the liquid crystal is arranged to have a spatially-variant refractive index. The projector is arranged to project an image onto the diffuser when the diffuser is operated in the light scattering mode. The driver is arranged to dynamically change the spatially-variant refractive index of the liquid crystal to provide a de-speckling effect to the image on the diffuser. The diffuser may also be operable in a transmissive mode and it may be switchable between the light scattering mode and the transmissive mode with the light scattering mode being selectively induced by voltage. The liquid crystal diffuser may comprise nematic or smetic-A liquid crystals. The image may be a holographic reconstruction and the display may form part of a Heads-up display (HUD) unit.