A touch sensing system, comprising: a display device including a touch sensor having a matrix of row electrodes and column electrodes ; drive logic coupled to the row electrodes and configured to drive the row 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 row electrodes , referred to for that stylus sync sub-frame as sync-driven row electrodes , with synchronization waveforms that are communicated electrostatically to cause synchronization of the display device with an active stylus ; and where for each of the stylus sync sub-frames, the drive logic is configured to differentially drive the sync-driven row electrodes of such stylus sync sub-frame, such that a first synchronization waveform used to drive one of the sync-driven row electrodes is different than a second synchronization waveform used to drive another of the sync-driven row electrodes ; where the drive logic is configured to, for each stylus sync sub-frame, differentially drive sync-driven row electrodes during that sub-frame such that, for a plurality of spatial groupings of sync-driven row electrodes , two or more different synchronization waveforms are used to drive the sync-driven row electrodes in the spatial grouping; wherein the drive logic is configured, for any given one of the stylus sync sub-frames, to select from among a plurality of sets of sync-driven row electrodes and differentially drive sync-driven row electrodes in that set of sync-driven row electrodes during the stylus sync sub-frame; and each set of sync-driven row electrodes omits some of the row electrodes of the matrix and differs from the other sets of sync-driven row electrodes . a display device including a touch sensor having a matrix of row electrodes and column electrodes ; drive logic coupled to the row electrodes and configured to drive the row 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 row electrodes , referred to for that stylus sync sub-frame as sync-driven row electrodes , with synchronization waveforms that are communicated electrostatically to cause synchronization of the display device with an active stylus ; and where for each of the stylus sync sub-frames, the drive logic is configured to differentially drive the sync-driven row electrodes of such stylus sync sub-frame, such that a first synchronization waveform used to drive one of the sync-driven row electrodes is different than a second synchronization waveform used to drive another of the sync-driven row electrodes ; where the drive logic is configured to, for each stylus sync sub-frame, differentially drive sync-driven row electrodes during that sub-frame such that, for a plurality of spatial groupings of sync-driven row electrodes , two or more different synchronization waveforms are used to drive the sync-driven row electrodes in the spatial grouping; wherein the drive logic is configured, for any given one of the stylus sync sub-frames, to select from among a plurality of sets of sync-driven row electrodes and differentially drive sync-driven row electrodes in that set of sync-driven row electrodes during the stylus sync sub-frame; and each set of sync-driven row electrodes omits some of the row electrodes of the matrix and differs from the other sets of sync-driven row electrodes . <EOS>