Digitizer, stylus and method of synchronization therewith

摘要

A method for operating a digitizer with an autonomous asynchronous stylus includes sampling outputs from a digitizer, detecting from the outputs at least one pulsed signal transmitted from an autonomous asynchronous stylus at a defined rate, determining a location of the stylus interaction with respect to the digitizer, and tracking stylus interaction with the digitizer over subsequent pulsed signals transmitted from the stylus.

主权项

1. A system comprising:
a sensor configured to receive signals on conductive lines arrayed along a first axis and a second axis; and a controller configured to:
trigger at a defined first time within a refresh cycle of the sensor, at least a portion of the conductive lines with a trigger signal and to sample output of the sensor based on the triggering to detect finger touch interaction;sample output of the sensor to detect a stylus signal transmitted by a stylus during the refresh cycle;detect a second time within the refresh cycle for sampling the sensor for the stylus signal; andsample output at the second time determined in subsequent refresh cycles to detect position of the stylus based on the stylus signal received by the sensor.