Wireless Sync for Active Pen Reducing Latency
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Solution Overview
Problem
Current synchronization methods between touch screens and active pens introduce significant time delays, affecting the response speed of the active pen and user experience due to reliance on time-sequence synchronization and blind detection of driving signals.
Innovation Solution
A synchronization method utilizing wireless communication chips, where a first indication signal is transmitted to the touch control chip and a second indication signal to the driving chip, with preset durations adjusted based on wireless transmission delays to ensure synchronized detection and transmission of driving signals, thereby reducing time delays and improving synchronization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-sequence synchronization based on protocol-agreed transmission and reception time sequence is used to establish connection between touch screen and active pen, then connection establishment is achieved, but significant time delays are introduced affecting response speed
Solution Approach 1:
The patent applies preliminary action by having the touch screen perform blind detection of driving signals before formal synchronization is established. The touch screen detects signals in advance during a detection window, so when synchronization occurs, the coordinate data is already available or nearly available, eliminating the need to wait for protocol-based signal transmission and reducing synchronization delay while maintaining connection reliability
Solution Approach 2:
The patent applies skipping by allowing the touch screen to skip the traditional protocol-based waiting period. Instead of strictly following the agreed transmission and reception time sequence, the touch screen rushes through the synchronization process by continuously detecting driving signals and obtaining coordinate data in advance, thereby reducing the perceived synchronization time delay while maintaining accurate connection establishment
2Speed
If blind detection of driving signals is used by touch screen, then response speed is improved, but synchronization precision deteriorates
Solution Approach 1:
The patent applies feedback by implementing a coordinated detection and transmission mechanism where the touch screen detects driving signals and the active pen transmits coordinate data in a synchronized manner. The protocol-based feedback loop ensures that detection windows and transmission timing are aligned, maintaining synchronization precision while allowing advance detection to improve response speed. The system continuously adjusts detection and transmission timing based on protocol feedback to maintain precision
Solution Approach 2:
The patent applies dynamics by making the detection window and signal transmission timing adjustable and adaptive. The touch screen dynamically opens detection windows at appropriate times, and the active pen dynamically transmits coordinate data based on synchronization signals. This dynamic coordination allows the system to maintain precise synchronization while enabling advance detection for faster response, as both devices adapt their timing to work together efficiently
Data Source
AI summary
The present application provides a synchronization method. The method includes: transmitting, by a first wireless communication chip of the electronic device, a synchronization signal to a second wireless communication chip of the active pen and simultaneously transmitting a first indication signal to a touch control chip of the touch screen; where the first indication signal is used to instruct the touch control chip to detect a driving signal transmitted by the active pen after from reception of the first indication signal, the second wireless communication chip is further configured to transmit a second indication signal to a driving chip of the active pen while receiving the synchronization signal, the second indication signal is used to instruct the driving chip to transmit the driving signal after from reception of the second indication signal, the second preset duration is less than the first preset duration.