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US 9,519,361 B2Granted
Active stylus
AssigneeApple Inc.
InventorsJonah A. Harley, David I. Simon
Life of this patent
Estimating the term…
Abstract
An active stylus is disclosed. The stylus includes an electrode at a tip of the stylus; and powered circuitry coupled to the electrode and configured for capacitively coupling the electrode with a capacitive touch sensor panel. The powered circuitry can further include drive circuitry configured to output a drive voltage at the electrode and/or sense circuitry configured to sense a voltage received at the electrode.
Claims21
An active stylus, comprising:
- an electrode at a tip of the stylus;
- powered circuitry coupled to the electrode and configured to capacitively couple the electrode with a capacitive touch sensor panel, the powered circuitry comprising:
- a clock to generate a drive voltage;
- a microcontroller connected to the clock and configured to control the drive voltage;
- and
- an amplifier connected to the microcontroller and configured to adjust the drive voltage and output the drive voltage at the electrode;
- and
- a wireless transceiver configured to synchronize the active stylus and the capacitive touch sensor panel.
5 more elements
A method for stimulating a capacitive touch sensor panel of a touch sensing device with an active stylus, comprising:
- generating a clock signal at the stylus;
- controlling the clock signal with a microcontroller to generate a drive signal;
- amplifying the drive signal to generate a stimulation signal;
- applying the stimulation signal at a powered electrode of the stylus;
- capacitively coupling the powered electrode with the capacitive touch sensor panel by forming a mutual capacitance between the powered electrode and the touch sensor panel;
- and
- synchronizing, with a wireless transceiver of the active stylus, the active stylus and the capacitive touch sensor panel.
4 more elements
Dependencies are inferred from the claim text.