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 method for operating a digitizer with a stylus wherein the digitizer includes a grid based digitizer sensor including conductive lines arrayed along a first and second axis of the digitizer sensor, the method comprising:
triggering at a defined time within a refresh cycle of the digitizer at least a portion of the conductive lines with a triggering signal; detecting finger touch interaction with the digitizer during the refresh cycle in response to the triggering; transmitting a signal by the stylus; sensing the signal of the stylus with the digitizer sensor during the refresh cycle of the digitizer; determining a time within the refresh cycle of the digitizer for sampling the signal transmitted by the stylus; and detecting position of the stylus in subsequent refresh cycles responsive to sampling the signal transmitted by the stylus at the determined time within the refresh cycle.