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CAPACITIVE TOUCH SCREEN

  • US 20110025631A1
  • Filed: 09/22/2010
  • Published: 02/03/2011
  • Est. Priority Date: 04/02/2008
  • Status: Active Grant
First Claim
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1. A capacitive touch screen, comprising:

  • a substrate (10) comprising a plate which is open in a central portion thereof other than a rim (11) or comprising a transparent solid plate;

    a first electrode plate (20) placed on an upper surface of the rim (11) of the substrate (10);

    an elastic spacer (30) placed on an upper surface of the first electrode plate (20), the elastic spacer (30) being variable in thickness in response to application of an external pressure so as to be restorable to original shape thereof;

    a second electrode plate (40) placed on an upper surface of the elastic spacer (30); and

    a transparent panel (50) placed on an upper surface of the second electrode plate (40) to cover an entire area of the substrate (10);

    wherein one electrode plate of the first electrode plate (20) and the second electrode plate (40) comprises four or more electrode plates arranged along the rim (11) of the substrate (10) at positions spaced apart from each other at predetermined intervals, the other electrode plate comprises a single electrode plate arranged over the rim (11) along the overall length thereof; and

    when a contact pressure is applied to a portion of the transparent panel (50), a distance (d) between the first electrode plate (20) and the second electrode plate (40) is restorably varied by elastic height variation of the elastic spacer (30), so that capacitances are varied at sensing points (S) corresponding to locations of the four or more electrode plates (20) or (40), and a touch location and a touch pressure are determined by variation rates of the capacitances measured at the sensing points (S).

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