Predictive Pairing for Active Stylus in Tiled Touch Displays
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Solution Overview
Problem
In tiled touch display systems, active input devices like active styluses experience latency and signal interference when moving from one touch display device to another, leading to visual jitter and inaccurate input due to the time-consuming pairing process and potential signal overlap.
Innovation Solution
The source touch display device predicts the active input device's movement to a target device based on its inputs, initiates pairing negotiations with the target device, and sends necessary pairing information to both the active input device and the target device, allowing seamless pairing as the input device moves, thereby reducing latency and signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active input device pairs with the target touch display device only after moving to it, then pairing is simple and reliable, but latency and signal interference occur during the transition
Solution Approach 1:
The source touch display device initiates pairing negotiations with the target device before the active input device actually moves to the target device. The controller predicts the movement based on touch input patterns and pre-establishes pairing information with the target device, so that when the device moves, pairing is already complete or nearly complete, eliminating latency while maintaining reliability through predictive timing
2Reliability
If the pairing process takes multiple communications over multiple touch input frames, then pairing is accurate and stable, but visual jitter and broken trace lines occur
Solution Approach 1:
Pairing negotiations and information exchange are initiated before the active input device completes its movement to the target device. This preliminary action allows the pairing process to overlap with the movement transition, ensuring pairing stability is maintained while eliminating the gaps that cause visual jitter and broken trace lines
Solution Approach 2:
The pairing process is made continuous by initiating it before movement completes and maintaining communication channels open during the transition. This ensures that touch input sensing remains uninterrupted, eliminating visual jitter while preserving pairing stability through continuous communication
3Stability of the object's composition
If the active input device continues to provide signals associated with the source device after moving, then signal consistency is maintained, but signal interference with other devices occurs
Solution Approach 1:
The controller monitors touch input signals to detect when the active input device has moved from the source device to the target device. Based on this feedback, the controller dynamically switches the signal association from source device to target device, maintaining signal consistency for each device while preventing interference between them through timely signal reassignment
Data Source
AI summary
A source touch display device includes a communication interface, a source touch sensor, and a controller. The communication interface is configured to communicatively couple the source touch display device with a target touch display device. The controller configured to receive, via the source touch sensor, touch inputs from an active input device, determine that the active input device will likely move from the source touch sensor to a target touch sensor of the neighboring target display device based on the touch inputs, send, via the communication interface, active input device pairing information to the target touch display device, receive, via the communication interface, target touch display device pairing information from the target touch display device, and send the target touch display device pairing information to the active input device to effect a pairing between the active input device and the target touch display device.