This invention relates to a method for reducing speckle patterns in a three-dimensional holographic reconstruction, where a controllable light modulator with an encoded hologram of a 3D scene is illuminated with coherent light, where modulated light is transformed by an optical reconstruction system into an eye position, where the 3D scene is reconstructed in a reconstruction space and where the illumination is controlled by a control means. The object of the invention, i.e. to reduce speckle patterns which occur during the reconstruction of a 3D scene in a holographic display device and to provide a near-real-time method with a carrier medium with conventional refresh frequency is solved in that the control means affects at least one characteristic of the coherent light such that multiple complex-valued wave fronts with differing wavelengths pass through the light modulator, are modulated with the encoded hologram values, and are transformed into the eye position by the optical reconstruction system, and create multiple reconstructions of the same 3D scene with slightly different speckle patterns at the same position in the reconstruction space, said reconstructions being averaged as a single reduced-speckle reconstruction of the 3D scene.
Verfahren und einrichtung zum reduzieren von speckle