Patent ID: 8351103

Claim:
Method for reducing speckle in a three-dimensional holographic reconstruction which is created in a holographic display device with a controllable light modulator on which a 3D scene is encoded and which is illuminated with sufficiently coherent light, comprising: generating, near an eye position of an observer eye a defined virtual observer window, where: the observer window is located in an image plane of a light source; and the observer window comprises only one diffraction order of a periodical reconstruction; and forming in the virtual observer window, using independent, mutually incoherent light distributions, independent, mutually incoherent sub-observer windows by controlling the illumination of said controllable light; wherein: complex-valued wave fronts of the same 3D scene jointly generate the independent, mutually incoherent light distributions in the observer window, so that a common division of the observer window into independent, mutually incoherent sub-observer windows is created for the entire 3D scene to be reconstructed, and that the reconstructions of the 3D scene are superposed in a reconstruction space in the same place in a mutually incoherent way, so that a single speckle-reduced reconstruction of the 3D scene is seen from the eye position.