Position, tilt, and twist detection for stylus
First Claim
1. A touch-sensitive display device, comprising:
- a touch sensor having a plurality of display electrodes; and
control logic coupled to the plurality of display electrodes, the control logic being configured to;
receive, for each of a plurality of stylus electrodes of an active stylus interacting with the touch-sensitive display device, a spatial capacitance measurement over the touch sensor for that stylus electrode, the plurality of stylus electrodes including at least a ring electrode that is slanted relative to an elongate axis of the active stylus and forms a continuous ring that encircles a body of the active stylus, such that a portion of the ring electrode is angled toward a tip of the active stylus and a portion of the ring electrode is angled away from the tip of the active stylus; and
determine, relative to the touch sensor, and based on spatial capacitance measurements of the stylus electrodes, (i) a tip position of the active stylus, (ii) a tilt parameter of the active stylus, and (iii) a twist parameter of the active stylus.
1 Assignment
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Accused Products
Abstract
A touch-sensitive display device includes a touch sensor having a plurality of display electrodes and control logic coupled to the plurality of display electrodes. The control logic is configured to receive, for each of a plurality of stylus electrodes of an active stylus interacting with the touch-sensitive display device, a spatial capacitance measurement over the touch sensor for that stylus electrode. Relative to the touch sensor, and based on spatial capacitance measurements of the stylus electrodes, the control logic is configured to determine (i) a tip position of the active stylus, (ii) a tilt parameter of the active stylus, and (iii) a twist parameter of the active stylus.
23 Citations
18 Claims
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1. A touch-sensitive display device, comprising:
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a touch sensor having a plurality of display electrodes; and control logic coupled to the plurality of display electrodes, the control logic being configured to; receive, for each of a plurality of stylus electrodes of an active stylus interacting with the touch-sensitive display device, a spatial capacitance measurement over the touch sensor for that stylus electrode, the plurality of stylus electrodes including at least a ring electrode that is slanted relative to an elongate axis of the active stylus and forms a continuous ring that encircles a body of the active stylus, such that a portion of the ring electrode is angled toward a tip of the active stylus and a portion of the ring electrode is angled away from the tip of the active stylus; and determine, relative to the touch sensor, and based on spatial capacitance measurements of the stylus electrodes, (i) a tip position of the active stylus, (ii) a tilt parameter of the active stylus, and (iii) a twist parameter of the active stylus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for a touch-sensitive display device having a touch sensor including a plurality of display electrodes, the method comprising:
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receiving, for each of a plurality of stylus electrodes of an active stylus interacting with the touch-sensitive display device, a spatial capacitance measurement over the touch sensor for that stylus electrode, the plurality of stylus electrodes including at least a ring electrode that is slanted relative to an elongate axis of the active stylus and forms a continuous ring that encircles a body of the active stylus, such that a portion of the ring electrode is angled toward a tip of the active stylus and a portion of the ring electrode is angled away from the tip of the active stylus; and determining, relative to the touch sensor, and based on the spatial capacitance measurements of the stylus electrodes, (i) a tip position of the active stylus, (ii) a tilt parameter of the active stylus, and (iii) a twist parameter of the active stylus. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An active stylus, comprising:
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a stylus tip including a tip electrode; a ring electrode slanted relative to an elongate axis of the active stylus and forming a continuous ring that encircles a body of the active stylus, such that a portion of the ring electrode is angled toward the stylus tip and a portion of the ring electrode is angled away from the stylus tip; and control logic coupled to the tip electrode and ring electrode, the control logic being configured to do one or both of; (a) drive one or more of the tip electrode and ring electrode to enable a stylus-initiated spatial capacitance measurement over a touch sensor of a touch-sensitive display device; (b) detect conditions on one or more of the tip electrode and ring electrode caused by a drive signal applied from the touch sensor, to enable a display-initiated spatial capacitance measurement over the touch sensor; and wherein either or both of the stylus-initiated spatial capacitance measurement and display-initiated spatial capacitance measurement are usable to calculate (i) a tip position of the active stylus, (ii) a tilt parameter of the active stylus, and (iii) a twist parameter of the active stylus, wherein the tilt parameter of the active stylus and the twist parameter of the active stylus are both derived from a spatial capacitance measurement associated with the ring electrode.
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Specification