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Capacitive Coupling of a Capacitive Touchscreen to a Printed Circuit and Controller

  • US 20120105356A1
  • Filed: 10/31/2010
  • Published: 05/03/2012
  • Est. Priority Date: 10/31/2010
  • Status: Active Grant
First Claim
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1. A capacitive touchscreen system, comprising:

  • a capacitive touchscreen comprising drive and sense touchscreen electrodes operably connected at one end to corresponding touchscreen electrode terminals, mutual capacitances existing between the drive and sense electrodes at locations where the drive and sense electrodes intersect, such mutual capacitances changing in the presence of one or more fingers or touch devices brought into proximity thereto;

    a touchscreen controller comprising controller terminals, the controller being configured to provide drive signals and to receive sense signals through the controller terminals, anda flex circuit comprising a plurality of flex circuit traces disposed between a first end and a second end thereof, the first end comprising first terminals corresponding to each of the flex circuit traces, the first terminals being operably connected to corresponding ones of the controller terminals, the second end comprising second terminals corresponding to each of the flex circuit traces;

    wherein the second terminals are spaced apart from, or in physical contact with, corresponding ones of the touchscreen electrode terminals, the second terminals are not soldered or otherwise physically attached to the touchscreen electrode terminals by means of an electrically conductive bonding agent or material, the second terminals are spaced apart from, or in physical contact with, the touchscreen electrode terminals by gaps ranging between about 0.0 mm and about 1 mm, and the gaps are sufficiently small to permit capacitive coupling of drive and sense signals provided by the touchscreen electrode terminals to the second terminals.

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