Touchscreen-Stylus Phase Error Compensation for Stable Synchronization
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Solution Overview
Problem
Communication disruptions occur between synchronized devices due to noise and clock skews, leading to phase errors that cause erroneous signal interpretation in capacitive coupling systems like smart stylus and touch screen devices.
Innovation Solution
A phase error compensation algorithm is implemented, where a touch screen controller measures time differences in received data signals and adjusts internal control signals to compensate for accumulated phase errors after each data packet, maintaining synchronization without the need for reinitialization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices communicate using capacitive coupling with initial synchronization, then wireless communication can be established between stylus and touch screen devices, but noise and clock skews cause accumulated phase errors that lead to communication disruptions
Solution Approach 1:
The patent implements a phase error compensation algorithm that continuously monitors the phase difference between transmitted and received signals, measures accumulated phase errors, and feeds back adjustment information to correct the phase alignment. This closed-loop feedback mechanism maintains synchronization accuracy despite noise and clock skews during capacitive coupling communication
Solution Approach 2:
The system dynamically adjusts timing parameters by measuring the actual phase error and modifying the phase alignment accordingly. The compensation algorithm changes the temporal parameters of signal sampling and transmission to counteract accumulated phase drift, ensuring accurate signal interpretation throughout the communication session
2Productivity
If synchronization is maintained continuously without reinitialization, then communication can proceed without interruptions, but phase errors accumulate over time causing erroneous signal interpretation
Solution Approach 1:
The patent applies preliminary phase error compensation by measuring and correcting phase drift before it significantly degrades signal interpretation. The system proactively adjusts phase alignment during ongoing communication based on measured errors, preventing erroneous interpretation before it occurs rather than waiting for synchronization failure
Solution Approach 2:
The compensation algorithm operates continuously throughout the communication session, constantly measuring phase errors and applying corrections without interrupting the data flow. This continuous adjustment maintains both communication productivity and phase synchronization accuracy simultaneously
3Reliability
If phase error compensation is applied after each data packet, then synchronization is maintained without reinitialization, but additional processing steps increase system complexity
Solution Approach 1:
The touch screen controller performs self-diagnosis and self-correction by measuring its own phase errors and generating compensating control signals internally. This self-service approach maintains synchronization stability without requiring external intervention or complex additional hardware, as the existing controller resources are utilized for compensation
Data Source
AI summary
A system and method for compensating for detected phase errors during communications between synchronized devices. In an embodiment, the two devices may be a touch screen device and a synchronized stylus device. To this end, the touch screen device includes a controller configured to receive data signals from the stylus at specific time intervals. The touch screen device generates an internal control signal for receiving the incoming data signals at an expected frequency. The touch screen device further includes circuitry for measuring differences in the time a data signal is actually received against when the data signal was expected to be received and determines a time difference (e.g., a phase error). Then, the internal control signal may be adjusted to compensate for the accumulated phase error. Such a measurement and compensation helps ensure that communications remain in synchronization without having to reestablish synchronization through a cumbersome synchronization process.