Stylus for capacitive touchscreen
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.
Claims10
A circuit configured for actively interacting with a capacitive touch sensor, comprising:
- an input, electrically coupled to a sensing electrode;
- an amplifier having a plurality of amplifier stages;
- and
- an output, electrically coupled to an emitting electrode,
- wherein the amplifier receives a signal from the input via the sensing electrode, inverts and amplifies the signal, and outputs the signal through the emitting electrode via the output, and
- 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 plurality of amplifier stages in the amplifier according to the threshold voltage.
Dependencies are inferred from the claim text.