Touch Sensing Column Grouping for Noise-Resistant Detection
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Solution Overview
Problem
Conventional touch detection methods in touch display panels are susceptible to background noise interference, leading to inaccurate touch event detection due to varying noise levels at different time points.
Innovation Solution
A touch detection method that dynamically adjusts the grouping order of touch sensing columns and merges adjacent sensor pads to ensure touch sensing signals are collected at the same timing, thereby reducing the impact of background noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch sensing columns are scanned using conventional fixed grouping methods, then the detection process is simple, but the detection precision deteriorates due to background noise interference at different time points
Solution Approach 1:
The patent applies dynamics by making the grouping order of touch sensing columns changeable across different frames. The controller dynamically adjusts which columns are grouped together based on previously detected touch positions, allowing the system to adapt to different touch scenarios and reduce noise interference from adjacent columns.
Solution Approach 2:
The patent applies local quality by applying different grouping strategies to different regions of the touch panel. Specifically, columns adjacent to detected touch positions are grouped differently from other columns, creating localized detection zones that reduce interference from nearby touch events while maintaining overall system performance.
2Reliability
If adjacent touch sensor pads are merged into merged units, then the resistance to background noise is improved, but the touch coordinate detection precision may deteriorate due to reduced resolution
Solution Approach 1:
The patent applies segmentation by dividing the touch sensing columns into different groups across multiple frames. Instead of merging all columns, the system segments them into different detection zones and scans different segments in different frames, allowing noise reduction through temporal separation while maintaining spatial resolution.
Solution Approach 2:
The patent applies periodic action by scanning different groups of touch sensing columns in different frames in a periodic manner. The controller alternates between different grouping configurations across frames, allowing the system to collect data from various regions over time and reconstruct accurate touch positions while averaging out background noise.
Data Source
AI summary
A touch detection method, suitable for a touch display panel including touch sensing columns, includes following steps. The touch sensing columns are grouped in a first order during a first frame. The touch sensing columns grouped in the first order are scanned for detecting a first touched column during the first frame. The touch sensing columns are grouped in a second order during a second frame. The second order is assigned according to the first touched column. The first touched column and adjacent columns next to the first touched column are grouped together in one group in the second order. The touch sensing columns grouped in the second order are scanned for detecting a second touched column during the second frame.