optical mems scanning micro - mirror comprising : — a movable scanning micro - mirror , being pivotally connected to a mems body substantially surrounding the lateral sides of the micro - mirror , — a transparent window substantially covering the reflection side of the micro - mirror ; — wherein a piezo - actuator assembly and a layer of deformable transparent material are provided on the outer portion of said window ; — the piezo - actuator assembly being arranged at the periphery of the layer of transparent material ; — said piezo - actuator assembly and transparent material cooperating so that when actuated , the piezo - actuator assembly causes micro - deformation of the transparent material , thereby providing an anti - speckle effect . the invention also provides the corresponding micro - projection system and method for reducing speckle .