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1. (WO2018144361) ACTIVE STYLUS DIFFERENTIAL SYNCHRONIZATION

Pub. No.:    WO/2018/144361    International Application No.:    PCT/US2018/015646
Publication Date: Fri Aug 10 01:59:59 CEST 2018 International Filing Date: Tue Jan 30 00:59:59 CET 2018
IPC: G06F 3/041
G06F 3/044
Applicants: MICROSOFT TECHNOLOGY LICENSING, LLC
Inventors: QIAO, Tianzhu
Title: ACTIVE STYLUS DIFFERENTIAL SYNCHRONIZATION
Abstract:
A touch-sensing system is disclosed. The system includes a display device including a touch sensor having a plurality of electrodes, and drive logic coupled to the plurality of electrodes and configured to drive the plurality of electrodes during a plurality of touch-sensing frames, each of which includes a stylus sync sub-frame during which the drive logic drives at least some of the plurality of electrodes, referred to for that stylus sync sub-frame as sync-driven electrodes, with synchronization waveforms that are communicated electrostatically to cause synchronization of the display device with an active stylus. For each of the stylus sync sub-frames, the drive logic may be configured to differentially drive the sync-driven electrodes of such stylus sync sub-frame, such that a first synchronization waveform used to drive one of the sync-driven electrodes is different than a second synchronization waveform used to drive another of the sync-driven electrodes.