Touch Sensor Scan Suspension for Display Interference Reduction
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Solution Overview
Problem
Display-integrated touch sensors experience interference and noise due to overlapping touch-sensitive areas with display screens, leading to undesirable effects like display flicker, especially when scanning and updating occur simultaneously.
Innovation Solution
Implementing an asynchronous touch scanning process that allows touch sensors to scan independently of display updates, avoiding interference by suspending scans during display update periods and resuming after interference is cleared.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch sensor scanning is performed simultaneously with display screen updates in overlapping areas, then touch sensing functionality is maintained, but display noise and flicker increase
Solution Approach 1:
The system proactively identifies expected interference between touch scanning and display updates before they occur. By estimating the areas to be scanned and updated and comparing their timing, the system suspends touch scanning in advance to prevent display noise and flicker, rather than reacting after interference occurs.
2Object-affected harmful factors
If touch sensor scanning is suspended during display updates to avoid interference, then display noise is reduced, but touch scanning coverage and responsiveness may be affected
Solution Approach 1:
The system dynamically adjusts the touch scanning schedule based on real-time display update timing. Instead of a fixed scanning pattern, the touch sensor controller flexibly suspends and resumes scanning operations to avoid display updates, optimizing both display quality and touch scanning effectiveness through adaptive timing adjustments.
Solution Approach 2:
The system changes the timing parameters of touch scanning operations to avoid overlap with display updates. By modifying when scans occur rather than changing the scanning mechanism itself, the system reduces display noise while maintaining touch scanning coverage and responsiveness.
3Object-affected harmful factors
If asynchronous touch scanning is implemented to avoid display interference, then display quality is improved, but system complexity increases
Solution Approach 1:
The touch sensor controller continuously monitors display update timing and uses this feedback to adjust its scanning schedule. By implementing a feedback loop that compares estimated scan areas with estimated update areas, the system automatically coordinates scanning to avoid interference without requiring complex external control mechanisms.
Data Source
AI summary
In certain embodiments, a touch sensor controller estimates an area of a display screen that a display controller will update at a first time and estimates an area of a touch sensor that the touch sensor controller is expected to scan at the first time. The touch sensor controller further identifies an expected interference based on a comparison between the update of the estimated area of the display screen by the display controller at the first time and the scan of the estimated area of the touch sensor by the touch sensor controller at the first time. Based on the expected interference, the touch sensor controller suspends, for a first time period, the scan of the estimated area of the touch sensor for touch events based on the expected interference. The touch sensor controller resumes the scan after the first time period.