Active stylus for use with touch-sensitive interfaces and corresponding method
First Claim
1. A stylus configured for actively interacting with a touch-sensitive interface, the stylus comprising:
- a stylus body; and
a compound tip extending axially from the stylus body, the compound tip comprising;
a center electrode configured to detect electric field variations;
a shroud electrode electrically and mechanically isolated from and disposed concentrically around the center electrode;
a suppression shroud, disposed between the center electrode and the shroud electrode, electrically isolated from each of the center electrode and the shroud electrode, wherein the suppression shroud is electrically coupled to a common node of the stylus; and
an active circuit coupled between the center electrode and the shroud electrode and configured to apply a gain to the electric field variations and to change a potential of the shroud electrode with the electric field variations.
3 Assignments
0 Petitions
Accused Products
Abstract
A stylus (100) is configured for actively interacting with a touch-sensitive interface (201) by injecting or sinking charge in response to a touch-detection signal emitted from the touch-sensitive interface (201). One stylus (100) includes a stylus body (104) and a compound tip (105) extending axially from the stylus body (104). The compound tip (105) can include a center electrode (101) that is configured to detect electric field variations from the touch-sensitive interface (201) and a shroud electrode (102) that is concentrically disposed about the center electrode (101). An active circuit (103) coupled between the center electrode (101) and the shroud electrode (102) is configured to apply a gain to the detected electric field variations and to change a potential of the shroud electrode (102) synchronously with the electric field variations detected by the center electrode (101).
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Citations
19 Claims
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1. A stylus configured for actively interacting with a touch-sensitive interface, the stylus comprising:
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a stylus body; and a compound tip extending axially from the stylus body, the compound tip comprising; a center electrode configured to detect electric field variations; a shroud electrode electrically and mechanically isolated from and disposed concentrically around the center electrode; a suppression shroud, disposed between the center electrode and the shroud electrode, electrically isolated from each of the center electrode and the shroud electrode, wherein the suppression shroud is electrically coupled to a common node of the stylus; and an active circuit coupled between the center electrode and the shroud electrode and configured to apply a gain to the electric field variations and to change a potential of the shroud electrode with the electric field variations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A stylus for active interaction with a touch-sensitive interface, comprising:
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a compound tip having concentrically aligned transmit and receive electrodes configured to produce a Miller capacitance between the compound tip and the touch-sensitive interface and a suppression shroud, disposed between the transmit and receive electrodes, electrically coupled to a common node of the stylus; and an active circuit configured to apply a gain to electric field variations detected by the receive electrode and inject charge into the touch-sensitive interface synchronously with electric field variations detected by the receive electrode of the compound tip. - View Dependent Claims (13, 14, 15, 16, 17)
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18. In a stylus, a method for interacting with a touch-sensitive user interface, comprising:
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detecting electric field variations with a receive electrode of a compound tip of the stylus; applying a gain with an active circuit to a signal corresponding to the electric field variations; suppressing negative feedback between the receive electrode and a transmit electrode of the compound tip; and injecting charge from the transmit electrode, synchronously with the signal corresponding to the electric field variations, by altering an electric field defined between the receive electrode and the transmit electrode, wherein the transmit electrode is electrically and mechanically isolated from the receive electrode and is disposed concentrically around the receive electrode. - View Dependent Claims (19)
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Specification