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Portable electronic device for use in conjunction with a screen

  • US 4,910,775 A
  • Filed: 07/11/1988
  • Issued: 03/20/1990
  • Est. Priority Date: 04/21/1988
  • Status: Expired due to Term
First Claim
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1. A portable electronic device comprising:

  • at least some optical reception means;

    a microcomputer suitable for processing data received;

    a display device to display data emanating from the microcomputer;

    an electrical source to supply power to various circuits;

    a keyboard enabling a user also to key in data into the microcomputer, and said microcomputer is programmed to use the data from at least one of the optical reception means and the keyboard and to display results taking account of said data, possibly in combination; and

    processors to apply self-adaptability to a screen, said processors having a capacitor whose charging and discharging through a resistor are controlled by the microcomputer, said processors obtaining a comparison threshold based on a level of optical reception.

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