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 isolated from and disposed about the center electrode; 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).
171 Citations
20 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 isolated from and disposed about the center electrode; 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, 12)
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13. 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 an active circuit configured to inject charge into the touch-sensitive interface synchronously with electric field variations detected by the receive electrode of the compound tip. - View Dependent Claims (14, 15, 16, 17, 18)
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19. 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; and injecting charge from a transmit electrode of the compound tip of the stylus, synchronously with the signal corresponding to the electric field variations, by altering an electric field defined between the receive electrode and the transmit electrode. - View Dependent Claims (20)
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Specification