Near Zero Laser Speckle Liquid Crystal Device

Laser-based displays suffer from speckle noise due to the random inference patterns of scattered coherent light from rough surfaces. Commonly utilized solution, such as moving diffusers, creates time-varying speckle patterns that were averaged on the observer's retina or the image sensor. This solution requires the use of motorized parts and can be bulky with the potential risk of mechanical failure. We present a liquid crystal device that reduces speckle noise by over 90%. It is electrically driven, compact, and with no motorized parts. The randomized, time-varying domains with mismatched refractive indices of the liquid crystals produce varying speckle patterns. A near zero speckle contrast is achieved.