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Reflection type input/output liquid crystal display

  • US 5,677,744 A
  • Filed: 04/28/1994
  • Issued: 10/14/1997
  • Est. Priority Date: 05/06/1993
  • Status: Expired due to Term
First Claim
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1. A display apparatus comprising:

  • a first substrate and a second substrate which are disposed to face each other;

    a display medium sandwiched between the first substrate and said second substrate, said display medium having variable optical characteristics;

    a display circuit provided on said first substrate;

    a reflection counter electrode provided on said second substrate for reflecting light which has passed through said display medium, said reflection counter electrode being formed between said second substrate and said display medium anda coordinate input means for inputting coordinates of a point on said first substrate; and

    wherein said coordinate input means includes;

    a plurality of coordinate input electrodes arranged in a matrix on said first substrate;

    first signal lines for supplying the coordinate determination signals to said coordinate input electrodes, respectively, said first signal lines being formed on said first substrate;

    first active elements for electrically connecting said plurality of coordinate input electrodes to said first signal lines, respectively;

    a coordinate designating member for, when said coordinate designating member is brought near said first substrate, forming an electrostatic capacitance with at least one of said plurality of coordinate input electrodes; and

    a coordinate determination means for receiving said coordinate determination signal from said at least one of said plurality of coordinate input electrodes, and for determining the coordinates of a point to which said coordinate designating member is closest, based on said received coordinate determination signal.

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