Stylus Signal Synchronization for Dynamic Refresh Rate Switching
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Solution Overview
Problem
Existing signal synchronization systems between electronic devices and styluses fail to detect changes in refresh rates in a timely manner, leading to synchronization issues and poor interaction quality due to the inability to adapt to switching refresh rates without signaling interactions.
Innovation Solution
The method involves the stylus monitoring uplink signals from the electronic device using the least common multiple of supported refresh rates, allowing it to detect rate changes without signaling interactions, ensuring timely synchronization by sampling and sending signals based on the least common multiple refresh rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stylus sends downlink signals based on the electronic device's refresh rate, then signal synchronization is maintained, but the stylus cannot detect refresh rate switching in a timely manner when the electronic device changes refresh rates dynamically
Solution Approach 1:
The stylus pre-calculates and stores the least common multiple (LCM) of all possible refresh rates (60Hz, 90Hz, 120Hz) before actual use. This LCM value (360Hz) is prepared in advance as the monitoring frequency, enabling the stylus to detect refresh rate changes immediately without waiting for signaling from the electronic device.
Solution Approach 2:
The stylus continuously monitors uplink signals from the electronic device at the pre-calculated LCM frequency (360Hz). By comparing the timing and frequency of received uplink signals against the expected pattern at this higher sampling rate, the stylus can detect when the electronic device switches refresh rates and adjust its downlink signal transmission accordingly, creating a closed-loop feedback system for synchronization.
2Loss of time
If the stylus monitors uplink signals at the least common multiple of all refresh rates, then refresh rate switching can be detected timely, but the monitoring frequency and processing load increase
Solution Approach 1:
The stylus monitors uplink signals at a frequency (360Hz) that is higher than any single refresh rate the electronic device might use. This excessive monitoring frequency ensures that no refresh rate change is missed, as the LCM of 60, 90, and 120 Hz is 360 Hz. The additional processing load is acceptable because it guarantees timely detection of all possible refresh rate transitions.
Solution Approach 2:
The system changes the monitoring parameter from a fixed refresh rate to a dynamic frequency based on the least common multiple of all possible refresh rates. This parameter transformation (from 60/90/120 Hz to 360 Hz monitoring) allows the stylus to adapt to any refresh rate the electronic device might use while maintaining a consistent, high-frequency monitoring approach that captures all changes.
Data Source
AI summary
A method applied to a signal synchronization system, a system, a stylus, and an electronic device. The system includes a stylus and an electronic device. The electronic device supports a first refresh rate and a second refresh rate. The method includes: after an electronic device is wirelessly connected to a stylus, the electronic device samples a downlink signal from the stylus based on a third refresh rate, where the third refresh rate is equal to a first refresh rate or a second refresh rate; and the stylus sends the downlink signal to the electronic device based on the third refresh rate, and samples an uplink signal from the electronic device at a fourth refresh rate, where the fourth refresh rate is the least common multiple of the first refresh rate and the second refresh rate.