×

Capacitive touch with driving conductive strips closer to an external object and without rear shielding layer

  • US 8,531,426 B2
  • Filed: 08/08/2012
  • Issued: 09/10/2013
  • Est. Priority Date: 12/30/2010
  • Status: Active Grant
First Claim
Patent Images

1. A detection method for a capacitive touch sensitive display, comprising:

  • providing a capacitive touch sensitive display for operated by at least one external conductive object, including;

    a double ITO (DITO) structure comprising;

    a first layer, comprising a plurality of exposed driving conductive strips which receive a driving signal during mutual capacitive detection;

    a second layer, comprising a plurality of exposed sensing conductive strips that provide a plurality of mutual capacitive coupling signals during mutual capacitive detection;

    an insulating layer disposed between said first layer and said second layer;

    wherein said first layer is closer to an external conductive object than said second layer; and

    wherein said plurality of driving conductive strips intersect with said plurality of sensing conductive strips;

    a display, wherein said DITO structure is directly disposed thereon;

    sending said driving signal to at a first driving conductive strip of said plurality of driving conductive strips continuously;

    generating a sensing information based on said mutual capacitive coupling signals provided by said plurality of sensing conductive strips each time when said driving signal is sent to said first driving conductive strip, wherein each value of said sensing information is a dual difference value between a first difference value and a second difference value, wherein said first difference value is a difference between a first and second sensing conductive strips among three neighboring conducting strips and said second difference value is a difference between a third and said second sensing conductive strips among said three neighboring sensing conductive strips;

    wherein two zero-crossings in said sensing information corresponds to a touch or proximity of an external conductive object and a zero-crossing is between a positive value and a negative value.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×