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Method of manufacturing display having diffraction grating patterns

  • US 5,132,812 A
  • Filed: 10/15/1990
  • Issued: 07/21/1992
  • Est. Priority Date: 10/16/1989
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing a display having diffraction grating patterns, comprising the steps of:

  • (a) obtaining a plurality of two-dimensional images by observing an object at a plurality of positions, and inputting images of the plurality of two-dimensional images to a computer;

    (b) selecting nth image data from the plurality of image data;

    (c) inputting data of a reproducing light source position and a view direction;

    (d) inputting predetermined dot data of the nth image data;

    (e) determining a pitch d and a direction Ω

    of a diffraction grating and an area of a dot on the basis of the data of the reproducing light source position and the view direction and the dot data, wherein the pitch d and a direction Ω

    are obtained according to the following equations;

    
    
    space="preserve" listing-type="equation">tan(Ω

    )=sin(α

    )/sin(θ

    )
    
    
    space="preserve" listing-type="equation">d=λ

    /√

    sin.sup.2 (θ

    )-sin.sup.2 (α

    ) where θ

    is the incidence angle of illumination light, α

    is the direction of 1st-order diffracted light, and λ

    is the wavelength of the 1-st order diffracted light;

    (f) moving an X-Y stage to a predetermined position on the basis of the dot data and delineating the grating by using an electron scanning unit;

    (g) sequentially incrementing an address of the dot data and repeating the steps (d) to (f) until all data corresponding to the nth image data are processed; and

    (h) selecting another image data, and repeating the steps (b) to (g) until all image data are processed.

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