Stylus for capacitive tochscreen
AssigneeAdonit Co., Ltd.
InventorsZachary Joseph Zeliff, Yueh Hua Li, TK Kao, Joseph Lin, Kuang Hou
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Abstract
Embodiments of amplifiers and electrodes for capacitive styluses are disclosed. The amplifiers detect an input signal from a capacitive touch sensor, such as a touchscreen or touchpad, amplify and invert the signal, and emit the amplified and inverted signal to cause the capacitive touch sensor to detect a touch. The electrode sets, or tips, pair a sensing electrode and an emitting electrode, shielded from each other to limit interference, in a fine-point non-deforming configuration that improves usability over existing stylus tips.
Claims27
A tip for an active stylus, comprising an emitting electrode, a shield, and a sensing electrode, wherein the emitting electrode is electrically insulated from the shield, and wherein the sensing electrode is electrically insulated from the shield.
A circuit for interacting with a capacitive touch sensor, the circuit comprising:
- an input, an amplifier comprising a plurality of amplifier stages, and an output,
- the amplifier receiving a signal from the input, inverting and amplifying the signal, and emitting the signal through the output,
- wherein the amplifier amplifies only a portion of the signal that exceeds a threshold voltage, by subjecting the signal through at least one level-setting element in each of the amplifier stages in the amplifier according to the threshold voltage.
(canceled)
A stylus for a capacitive sensor, the stylus comprising:
- a stylus body,
- a circuit disposed within the stylus body,
- a tip, the tip comprising a sensing electrode, a shield, and an emitting electrode, the tip disposed on a proximal end of the stylus body, and
- a power source, the power source electrically coupled to the circuit,
- an input of the circuit electrically coupled to the sensing electrode of the tip,
- an output of the circuit electrically coupled to the emitting electrode of the tip,
- where the circuit receives a signal through the sensing electrode, amplifies and inverts the signal, and outputs the signal through the emitting electrode,
- wherein an amplifier of the circuit amplifies only a portion of the signal that exceeds a threshold voltage, by subjecting the signal through at least one level-setting element in each of a plurality of amplifier stages in the amplifier according to the threshold voltage.
Dependencies are inferred from the claim text.