Active stylus
First Claim
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1. 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.
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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.
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Citations
21 Claims
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1. An active stylus, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for stimulating a capacitive touch sensor panel of a touch sensing device with an active stylus, comprising:
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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. - View Dependent Claims (19, 20, 21)
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Specification