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Method for forming a computer generated hologram

  • US 5,119,214 A
  • Filed: 03/26/1991
  • Issued: 06/02/1992
  • Est. Priority Date: 03/26/1990
  • Status: Expired due to Term
First Claim
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1. A method for producing a computer generated hologram to be used for a liquid crystal spatial light modulator having a plurality of pixels to be controlled to open completely or to close completely, wherein a cell being composed of a plurality of pixels is a unit for displaying the amplitude component and the phase component of a coherent wave disturbance, and a cell may have an aperture composed of pixels adjacent to each other to express the amplitude and phase components, said amplitude component for a cell being expressed by the area of the aperture, said phase component being expressed by the distance of the aperture from the center of the cell, comprising the steps of:

  • (a) calculating the amplitude component and the phase component for each cell;

    (b) adding the phase distortion component to said phase component by using experimental data of phase distortion of a pixel; and

    (c) determining the center of the aperture in each cell according to the result of said adding step and the area of the aperture according to said amplitude component.

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