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Touch panel and electronic device including the same

  • US 8,749,498 B2
  • Filed: 05/17/2010
  • Issued: 06/10/2014
  • Est. Priority Date: 06/19/2009
  • Status: Active Grant
First Claim
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1. A touch panel comprising:

  • a first substrate;

    a second substrate that is spaced apart from the first substrate by a gap, the second substrate comprising a contact surface;

    a plurality of driving electrodes that are formed on each of the first substrate and the second substrate;

    an electro-rheological fluid that fills the gap between the first substrate and the second substrate; and

    a controller configured to apply a driving voltage between at least two opposing driving electrodes of the plurality of driving electrodes such that, a button area is delimited due to a variation in viscosity of a portion of the electro-rheological fluid between the at least two opposing driving electrodes, and cut off the driving voltage when a thickness of the gap between the first and second substrates at the button area is reduced to a value equal to or less than a threshold due to a pressing force applied to the contact surface at the button area.

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