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Scan type display device with image scanning function

  • US 5,670,971 A
  • Filed: 12/19/1994
  • Issued: 09/23/1997
  • Est. Priority Date: 09/26/1994
  • Status: Expired due to Fees
First Claim
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1. A scan type display device comprising a device body carrying a light emitting cell array including a plurality of light emitting cells arrange in a linear alignment for scanning an aerial plane to display a desired image by utilizing a residual image effect, said light emitting cells being selectively illuminated according to image data stored in a memory and in synchronism with motion of said device body, said display device further comprising:

  • light receiving means including at least one light receiving element provided on said device body, said light receiving element being positioned to receive a reflected light from a to-be-sampled image displayed on an image carrying medium, when such image is placed in proximity and in opposition to said light emitting cell array and is illuminated by said light emitting cells;

    means for illuminating each individual light emitting cell of said light emitting array in a predetermined order for sampling line image data of a single display line of such to-be-sampled image; and

    means for detecting shifting of such to-be-sampled image so as to terminate sampling of line image data of a previous display line of such to-be-sampled image and to sample line image data of a next display line of such image.

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