Active Pen Synchronization Using Wireless Timestamp Feedback
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Solution Overview
Problem
Existing synchronization methods between touch screens and active pens are inefficient, leading to delays in detecting the pen tip position and maintaining long-term synchronization, which affects user experience and responsiveness.
Innovation Solution
A synchronization method using a wireless communication chip to transmit time stamp information associated with the synchronization signal, allowing the touch screen and active pen to synchronize based on this information, thereby avoiding delays and improving responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional synchronization methods are used between touch screen and active pen, then the system can establish connection, but the response speed for detecting pen tip position is slow and synchronization cannot be maintained for long time
Solution Approach 1:
The touch screen sends a synchronization signal at a predetermined time point before the active pen actually writes, allowing the active pen to advance its internal clock and pre-synchronize. This preliminary action enables the system to detect pen tip position immediately when the pen approaches the screen, eliminating initial detection delays and achieving fast response speed from the first writing.
Solution Approach 2:
The active pen receives the synchronization signal from the touch screen, compares it with its own timing, and adjusts its internal clock accordingly. This feedback mechanism allows the active pen to continuously correct its timing and maintain synchronization with the touch screen over extended periods, solving the problem of synchronization drift.
2Measurement precision
If the touch screen blindly detects driving signal of active pen, then connection can be established, but delay occurs in detecting pen tip position
Solution Approach 1:
Instead of waiting for the active pen to send a detection signal, the touch screen proactively sends a synchronization signal at a predetermined time point. This preliminary action allows the system to be ready for detection before the pen actually contacts the screen, eliminating the blind detection delay and enabling immediate position detection when the pen approaches.
Data Source
AI summary
The present application provides a synchronization method and a synchronization device, which may effectively realize synchronization between a touch screen and the active pen. The synchronization method is configured for time synchronization between a first detection chip of a first device and a second detection chip of a second device, and the method includes: a first wireless communication chip connected to the first detection chip, receiving the first synchronization signal sent by the first detection chip at a first moment; the first wireless communication chip sending time information associated with the first moment to a second wireless communication chip connected to the second detection chip; and the time information being configured to determine a second moment for the first detection chip to send the synchronization signal next time, so that the second detection chip is synchronized with the first detection chip at the second moment.