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3D display

  • US 7,230,746 B2
  • Filed: 11/02/2001
  • Issued: 06/12/2007
  • Est. Priority Date: 11/07/2000
  • Status: Expired due to Fees
First Claim
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1. A diffraction specific computer generated holographic display for replay of a hologram into an image volume, said image volume having a plurality of image volume points, said display comprising:

  • at least one spatial light modulator (SLM) to which diffraction data is written to produce a diffraction pattern thereon, wherein the diffraction pattern is notionally divided into a plurality of hogels and each hogel is divided into a plurality of points;

    image calculation means for calculating diffraction data which is independent of the image to be displayed, relating each image volume point to each hogel by performing pre-processing steps and for using at least some of said diffraction data in image replay steps, said pre-processing steps comprising the steps of;

    i) calculating a plurality of sample values at a plurality of sample points on each hogel, said sample values representing a calculated curved wavefront radiating from each image volume point to each hogel;

    ii) calculating a set of complex spatial frequency coefficients from the sampled values and storing said set for said image replay steps;

    said image replay steps comprising the steps ofi) defining a three-dimensional image to be replayed by said display by selection of a sub-set of image volume points; and

    ii) summing a sub-set of said stored set of complex spatial frequency coefficients corresponding to said sub-set of image volume points;

    writing means for writing a diffraction pattern to the corresponding hogel on the SLM calculated from the summed set of spatial frequency coefficients; and

    a light source for illuminating the SLM so as to project curved, real wavefronts from said SLM to said image volume.

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