Touch Coordinate Correction for Display Panel Edge Sensitivity
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Solution Overview
Problem
Display devices experience reduced touch sensitivity and accuracy in the peripheral areas due to increased raw data saturation over time and environmental changes, leading to improper touch operations.
Innovation Solution
A method for detecting touch coordinates that involves generating and correcting touch coordinates based on raw data variation, using an offset value to extend the distance between reference lines and touch coordinates, and normalizing raw data to adaptively improve touch performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the display device operates for a long time and is affected by environmental changes, then the raw data of touch nodes in the peripheral area increases, but this results in saturation state and decreased touch sensitivity
Solution Approach 1:
The patent applies preliminary action by detecting raw data variation amounts before saturation occurs and proactively correcting touch coordinates through offset values. The system continuously monitors raw data changes in peripheral touch nodes and applies corrective offsets to touch coordinates before the saturation state significantly degrades touch sensitivity, preventing the problem rather than reacting to it.
Solution Approach 2:
The patent implements feedback by continuously monitoring raw data variation amounts from touch nodes and using this information to dynamically adjust touch coordinate corrections. The system measures the variation in raw data, calculates appropriate offset values, and applies these corrections to maintain accurate touch detection despite environmental changes and prolonged operation.
2Quantity of substance
If raw data continues to increase in peripheral touch nodes, then more touch information is captured, but the raw data exceeds representation range causing saturation and reduced touch accuracy
Solution Approach 1:
The patent applies parameter changes by transforming the raw data parameter through offset corrections. When raw data variation exceeds a threshold indicating approaching saturation, the system calculates offset values based on the variation amount and applies these offsets to adjust the touch coordinates, effectively changing the parameter representation to maintain accuracy within the data range.
Solution Approach 2:
The patent converts the harmful effect of raw data saturation into a benefit by using the raw data variation amount itself as the basis for calculating correction offsets. The variation that indicates degradation is transformed into useful information for generating corrective offset values, turning the saturation problem into a self-correcting mechanism.
3Measurement precision
If touch coordinates are corrected based on raw data variation amount, then touch performance in peripheral areas is improved, but the system complexity increases due to offset calculation and coordinate extension
Solution Approach 1:
The patent applies segmentation by dividing the touch panel into different regions (peripheral areas with reference lines and central areas) and applying correction logic specifically to peripheral touch nodes. The system identifies touch nodes near reference lines and applies offset-based coordinate extension only to these segments, rather than uniformly processing all touch nodes, thereby reducing overall system complexity while improving peripheral touch performance.
Data Source
AI summary
According to an embodiment of the present specification, a touch coordinate detection method includes generating touch coordinates based on raw data, and correcting the touch coordinates, wherein correcting the touch coordinates includes extending a first distance between a reference line and the touch coordinates to a second distance, and correcting the touch coordinates using the second distance, wherein the second distance is calculated as a value corresponding to the first distance based on an offset value calculated according to the variation value of the raw data. Accordingly, the touch performance in the peripheral area of the display panel is adaptively and significantly improved.