Touchscreen Row-Scan Synchronization for Continuous Stylus Input

The patent implements periodic touch signal collection at fixed intervals (e.g., every S rows of pixels) regardless of frame rate changes. This periodic sampling ensures consistent timing for stylus signal reception, preventing discontinuous lines while allowing frame rate adaptation. The fixed periodic collection rhythm maintains reliability during dynamic refresh rate switching.

The patent performs preliminary time alignment between the electronic device and stylus before actual stylus input occurs. By pre-synchronizing the timing references and establishing a fixed signal collection schedule in advance, the system ensures that stylus signals will be reliably captured regardless of subsequent frame rate changes, preventing discontinuous lines proactively.

The patent introduces a separate timing dimension for touch signal collection that is independent from the display refresh cycle. Instead of coupling signal collection to frame refresh events, it establishes a parallel timing reference based on pixel row scanning intervals. This dimensional separation allows fixed-interval signal collection to maintain stylus continuity while operating independently from display refresh synchronization.

The patent uses the pixel row scanning mechanism as an intermediary to bridge between the display system and touch signal collection. By counting pixel rows scanned (S rows per collection interval) rather than directly synchronizing with frame refresh events, the system creates an intermediate timing reference that decouples touch collection from display refresh while maintaining manageable control through the scanning counter.