Edge Coordinate Compensation for Touch Sensing Systems
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Solution Overview
Problem
Existing touch sensing systems face challenges in accurately converting coordinates of touch points on the edge portions of touch screens, often resulting in these coordinates being outside the active area, which affects touch recognition and sensitivity.
Innovation Solution
A method is introduced that calculates and modifies the coordinates of a touch point based on the display panel's resolution, determining if they are in the bezel area, and if so, adjusts them to be within the active area by using an edge coordinate compensation algorithm, ensuring accurate touch recognition and improved sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coordinate conversion algorithm is used to convert touch point coordinates based on display panel resolution, then coordinate conversion is achieved, but coordinates of touch points in edge portions may be present outside the active area
Solution Approach 1:
The patent applies preliminary anti-action by detecting whether converted coordinates fall outside the active area before final processing, and preemptively correcting such coordinates through edge coordinate compensation. This prevents the harmful effect of invalid coordinates being processed further, resolving the contradiction between achieving coordinate conversion and ensuring coordinate validity.
Solution Approach 2:
The patent converts the harmful effect of coordinates falling outside the active area into a beneficial correction process. By identifying these out-of-bound coordinates and systematically compensating them to map onto the active area edges, the system transforms potential errors into valid touch inputs, improving both conversion accuracy and coordinate reliability.
2Ease of manufacture
If touch sensors are reduced in number compared to display panel pixels, then manufacturing cost is reduced, but touch screen resolution becomes lower requiring coordinate conversion
Solution Approach 1:
The patent applies parameter changes by systematically transforming touch coordinates from the touch sensor coordinate system to the display panel coordinate system through conversion algorithms and edge compensation. This allows the system to maintain low sensor count for cost-effectiveness while achieving high effective resolution through mathematical parameter transformation.
3Device complexity
If coordinates of touch points in edge portions are not compensated, then processing is simpler, but touch recognition accuracy at edges deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the coordinate processing into distinct stages: initial coordinate conversion, edge area detection, and conditional edge coordinate compensation. This segmented approach maintains simplicity for normal cases while adding precision correction only where needed at edges, balancing processing complexity with recognition accuracy.
Data Source
AI summary
A method of compensating for coordinates of an edge portion of a touch sensing system is disclosed. The method includes calculating coordinates of a touch point, suitably converting the coordinates of the touch point based on a resolution of a display panel, deciding whether or not current coordinates of the touch point are present in a bezel area outside an active area of the display panel, in which an image is displayed, and when the current coordinates of the touch point are present in the bezel area, modifying the current coordinates of the touch point into edge coordinates of the active area contacting the bezel area.