US 10,095,347 B2 · Passive stylus and grip shadow recognition

Abstract

Various embodiments provide an object recognition process that is configured to detect a passive stylus and reject non-passive stylus objects on a touch screen, including an edge portion of the touch screen. In one embodiment, the object recognition process includes receiving sense signals from sense elements of a sense array in response to a touch object being on the sense array, selecting three sense signals from three respective sense elements, calculating a first sum of the strengths of the three selected signals, calculating a second sum of the strengths of two of the selected signals which are greater than the strength of one of the selected signals; and determining a type of the object (e.g., a passive stylus or a user hand's grip shadow) based on the first sum and the second sum.

Claims6

Dependent claims

A stylus sensor comprising:

reception circuitry which receives three signals having signal strengths S1, S2 and S3 from three sense elements respectively corresponding to three positions indicated by an object in an edge portion of a sensor array having a plurality of sensor elements in rows and columns, wherein the position corresponding to S2 is interposed between the positions corresponding to S1 and S3;
and
a processor coupled to the reception circuitry which, in operation
(a-i) determines the object as a stylus if S1+S2+S3 is less than a defined threshold value;
(a-ii) determines the object as a stylus if S1+S2+S3 is not less than the defined threshold value and if the object is positioned in a center of one of the three sense elements;
and
(b) determines the object as not a stylus if S1+S2+S3 is not less than the defined threshold value and if the object is not positioned in a center of one of the three sense elements.

4 more elements

Dependencies are inferred from the claim text.

Passive stylus and grip shadow recognition

Life of this patent

Passive stylus and grip shadow recognition

Life of this patent

Abstract

Claims6