Stylus Uplink Confirmation Timing for Stable Writing Pairing
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Solution Overview
Problem
Existing electronic devices with styluses experience sudden disabling of writing operations due to the stylus failing to receive uplink signals, leading to unexpected cancellation of pairing and loss of detection.
Innovation Solution
Implement a method where the stylus and sensor controller periodically transmit uplink signals, adjust transmission and reception schedules based on signal reception timing, and continue uplink signal receiving operations or transmit tone signals when the uplink is not received within a predetermined time, ensuring continuous communication and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stylus operates in a fixed cycle uplink signal receiving operation in discovery state, then the stylus can initially establish connection with sensor controller, but when uplink signal reception fails the stylus returns to discovery state causing pairing cancellation and writing operation disruption
Solution Approach 1:
The patent implements dynamic state transitions within the operational state, allowing the stylus to switch between normal operational mode and uplink signal reception confirmation mode based on reception status. This dynamic adjustment prevents premature return to discovery state, maintaining pairing and writing operation continuity while adapting to signal reception conditions.
Solution Approach 2:
The patent introduces a confirmation period during which the stylus continues to monitor for uplink signals before returning to discovery state. This preliminary action ensures that temporary signal losses do not trigger premature pairing cancellation, thereby preventing writing operation disruptions while maintaining system reliability.
2Reliability
If the sensor controller cancels pairing when no downlink signal is received for a fixed period, then the sensor controller can detect abandoned styluses, but legitimate styluses experiencing temporary signal loss are incorrectly canceled causing writing operation disruption
Solution Approach 1:
The patent implements a feedback mechanism where the stylus actively monitors uplink signal reception and provides status information to prevent incorrect pairing cancellation. The sensor controller receives confirmation during the confirmation period that distinguishes between abandoned styluses and those experiencing temporary signal loss, maintaining pairing stability while ensuring writing operation availability.
Solution Approach 2:
The patent introduces a confirmation period as a buffer between signal loss detection and pairing cancellation. This cushioning period allows the system to distinguish between temporary signal interruptions and genuine abandonment, preventing premature pairing cancellation and maintaining writing operation continuity while still detecting truly abandoned styluses.
3Device complexity
If the stylus transmits downlink signal according to fixed schedule, then the communication protocol remains simple and predictable, but when uplink signal is not received the downlink transmission cannot proceed causing detection loss and pairing cancellation
Solution Approach 1:
The patent introduces dynamic conditional logic to the communication protocol, where downlink signal transmission is contingent upon successful uplink signal reception during the confirmation period. This dynamic adjustment maintains protocol simplicity while improving communication reliability by preventing downlink transmissions when uplink signals are absent, thereby avoiding detection loss and pairing cancellation.
Data Source
AI summary
A method to be performed by a sensor controller that periodically transmits an uplink signal, and by a stylus that, upon receiving the uplink signal, determines a transmission and reception schedule for a downlink signal and the uplink signal on the basis of the reception timing of the uplink signal. The method includes executing, by the stylus, an uplink signal receiving operation for a first predetermined period of time according to the transmission and reception schedule. The method includes, responsive to the uplink signal not received through the receiving operation and expiration of the first predetermined period of time, continuing, by the stylus, the uplink signal receiving operation for a second predetermined period of time, instead of transmitting the downlink signal according to the transmission and reception schedule.