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Capacitive sensors for grip sensing and finger tracking

  • US 10,139,869 B2
  • Filed: 07/23/2014
  • Issued: 11/27/2018
  • Est. Priority Date: 07/23/2014
  • Status: Active Grant
First Claim
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1. A capacitive sensing apparatus usable with an electronic device with a display screen for grip sensing and/or finger tracking, wherein the capacitive sensing apparatus comprises:

  • first capacitive sensors comprising a first set of strips spatially arranged in a first line on a first edge of the electronic device, the first set of strips having respective lengths and spacings between the first set of strips spanning lengthwise across the first line, wherein each strip of the first set of strips is configured to generate a respective response to an object positioned near the first line; and

    wherein the respective response of each strip of the first set of strips is saturated and non-varying when an object is positioned along the length of a respective strip of the first set of strips, and the respective response of each strip of the first set of strips is varying and tapers off as an object moves away from either end of the length a respective strip of the first set of strips;

    wherein the respective lengths of each of the first set of strips are predetermined to reduce a span in which a respective response of each strip of the first set of strips may be saturated, and the respective spacings of the first set of strips are predetermined such that a respective varying and tapering response between each strip of the first set of strips is calculated as a reciprocal of a distance of the object, at least in part;

    one or more processors configured for;

    receiving first capacitive sensor measurements generated by each strip of the first set of strips in response to an object positioned near the first line;

    determining ratio values from the first capacitive sensor measurements wherein, the ratio values represent magnitudes of each strip of the first set of strips and are based on calculating one or more gain independent ratios of the first capacitive sensor measurements;

    generating a cross-correlation matrix from at least one of the first capacitive sensor measurements and the ratio values;

    inferring grip sensing information or finger tracking information based on at least one of the ratio values and the cross-correlation matrix; and

    reporting the grip sensing information or finger tracking information.

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