Touch Trajectory Display Control for Low-Latency Handwriting
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Solution Overview
Problem
Existing display apparatuses struggle to accurately predict touch trajectories in environments other than straight lines, leading to delays and user inconvenience.
Innovation Solution
A display apparatus with a touch sensor and processor that determines whether to predict a subsequent trajectory based on touch context information, including speed and other factors, and adjusts display accordingly to minimize latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If prediction algorithms are used to display trajectory at the same time as user writing, then the gap between writing time and trajectory display time is minimized, but the prediction trajectory impedes the user in environments other than straight lines
Solution Approach 1:
The system changes the parameter of prediction activation based on touch speed. When touch speed exceeds a threshold, prediction is disabled and actual touch trajectory is displayed; when touch speed is below the threshold, prediction is enabled. This parameter-based conditional approach resolves the contradiction by adapting the prediction behavior to the specific writing context.
Solution Approach 2:
The system dynamically adjusts between prediction mode and actual touch display mode based on real-time touch speed detection. The prediction function is activated or deactivated dynamically during writing, allowing the system to provide prediction benefits when appropriate while avoiding impediments when writing speed varies.
2Loss of time
If prediction algorithms are applied in all writing environments, then trajectory display latency is reduced, but the complexity of the prediction system increases and accuracy decreases for non-straight line trajectories
Solution Approach 1:
Instead of applying prediction algorithms in all writing environments, the system applies prediction partially - only when touch speed is below the threshold. This partial action approach reduces system complexity and avoids unnecessary prediction computations while still providing latency reduction benefits in appropriate contexts.
3Loss of time
If prediction trajectory is displayed for slow writing, then latency is minimized, but the area of prediction error increases
Solution Approach 1:
The system incorporates feedback by comparing predicted trajectory with actual touch trajectory and detecting errors. When prediction error exceeds a threshold, the system switches to displaying actual touch trajectory, thereby controlling prediction error area while maintaining latency benefits where prediction is accurate.
Data Source
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AI summary
A display apparatus is disclosed. The display apparatus includes a display panel including a touch sensor, and a processor configured to, based on receiving a touch input signal for an area of the display panel from the touch sensor, control the display panel to display a touch trajectory corresponding to the touch input signal in the area, and based on touch context information including speed information corresponding to the touch input signal, determine whether to display a subsequent trajectory of the displayed touch trajectory.