Stylus Uplink Channel Switching for Electrode Interference
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Solution Overview
Problem
Electronic devices using styluses experience issues such as ink discharge failure, writing disconnection, and latency due to interference in electrodes during touch or writing operations.
Innovation Solution
A control method for a stylus with multiple electrodes and a control module that dynamically switches receiving channels based on signal decoding status to ensure reliable signal reception and decoding, including alternating channel usage and polling mechanisms to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stylus uses multiple electrodes to receive uplink signals simultaneously, then signal reception capability is improved, but interference between electrodes causes decoding failures and writing disconnection
Solution Approach 1:
The patent implements periodic switching between different receiving channels in a fixed sequence. The control module alternates between the first receiving channel (first electrode) and second receiving channel (second electrode) at regular intervals, allowing each electrode to receive signals periodically without continuous interference. This periodic action resolves the contradiction by temporal separation of signal reception across multiple electrodes.
Solution Approach 2:
The patent dynamically adjusts the receiving channel configuration based on decoding results. When decoding fails on one channel, the system switches to another channel for the next frame. This dynamic adaptation allows the system to respond to interference conditions in real-time, maintaining reliable signal reception while avoiding the harmful effects of static multi-electrode simultaneous reception.
2Measurement precision
If the stylus continuously monitors uplink signals on all receiving channels, then signal detection capability is improved, but power consumption increases and latency occurs
Solution Approach 1:
The system employs periodic sampling of uplink signals rather than continuous monitoring. By switching between receiving channels in periodic intervals and activating electrodes only during their designated time slots, the system maintains adequate signal detection capability while reducing the time resources spent on signal processing, thereby minimizing latency.
Solution Approach 2:
The control module determines in advance which receiving channel will be active for each frame based on a predetermined switching sequence. This preliminary determination eliminates the need for real-time channel selection decisions, reducing processing latency while ensuring that the appropriate channel is ready to receive signals when needed.
3Reliability
If the stylus switches receiving channels frequently to avoid interference, then decoding success rate is improved, but signal synchronization between electronic device and stylus deteriorates
Solution Approach 1:
The patent implements a fixed periodic switching sequence between receiving channels that is predetermined and consistent. Both the electronic device and stylus follow the same periodic pattern, ensuring that channel switching occurs at predictable intervals. This periodic approach improves decoding success by avoiding interference while maintaining synchronization stability through the regular, predictable nature of the switching pattern.
Solution Approach 2:
The control module uses feedback from decoding results to verify that the periodic switching is achieving the desired effect. When decoding succeeds, the system continues with the current periodic pattern; if decoding fails, the system can adjust the switching parameters. This feedback mechanism ensures that the periodic switching maintains both high decoding success rates and stable signal synchronization.
Data Source
AI summary
A control method, a stylus, and a touch system. When a stylus is in a working mode, based on status information of an Nth frame of an uplink signal, a target receiving channel is controlled to be turned on in a preset manner to receive an (N+1)th frame of the uplink signal sent by an electronic device based on the target receiving channel, where the target receiving channel includes a first receiving channel formed between a first electrode and a control module, and/or a second receiving channel formed between a second electrode and the control module. Therefore, when an uplink signal received by the second electrode is interfered with, an uplink signal can also be normally received to be successfully decoded within a periodicity in which the first electrode works alone.