Volumetric Displays:

    In a volumetric display, the image to be displayed is divided into slices, and the slices are then presented to the viewer in very rapid succession so that the viewer perceives a persistent, continuous object.  The image is typically sliced in one of two ways.  Translational slicing cuts the image into a series of parallel planes from front to back, like a sliced loaf of bread.  Rotational slicing cuts the image into a set of planes that rotate around the center of the image, more like a sliced pizza or pie.  The data contained in each slice must be projected onto a screen of some sort, whether physical or virtual, that either translates or rotates from slice to slice.  DLP-based systems are utilized for both projecting the slice information and creating virtual screens onto which the slice information is projected.  Using a high-resolution DMD to illuminate the pixels of a 2D slice is straightforward and the basic function of digital projection systems.  A DMD creates virtual slices by selecting a column of mirrors (translational) or a diagonal line of mirrors (rotational) that directs light to select a narrow slice of the display volume (the virtual screen) to direct slice information to the viewer. Current DLP operating speeds can potentially generate images containing millions of volume pixels (voxels) without flicker or artifacts. The benefit of this approach is that a true 3D image is created with very close to natural depth cues.

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