Touch Control Circuit Sensitivity Compensation
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Solution Overview
Problem
Touch sensing technologies face variations in sensitivity across different locations on a touch panel, leading to inconsistent touch recognition and increased computational load in determining touch events.
Innovation Solution
A touch control circuit that includes a touch detection circuit, offset determination circuit, threshold compensation ratio determination circuit, and final threshold determination circuit to adjust sensitivity thresholds based on measured data, forming a lookup table to optimize touch recognition and reduce computational load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a uniform threshold is used for touch detection across the entire touch panel, then the device complexity is reduced, but touch sensing sensitivity varies significantly by location leading to poor touch recognition ratio
Solution Approach 1:
The patent divides the touch panel into multiple regions (e.g., first region and second region) and applies different threshold values to each region. Specifically, a first threshold is used for the first region and a second threshold is used for the second region, where the thresholds are differentiated based on location-specific sensitivity characteristics. This local differentiation resolves the contradiction by maintaining uniform touch recognition across the panel while avoiding the complexity of continuous variable thresholds.
2Manufacturing precision
If location-specific threshold adjustment is implemented to improve touch recognition ratio, then touch sensing sensitivity uniformity is improved, but device complexity increases due to multiple threshold management
Solution Approach 1:
The touch panel is segmented into discrete regions (first region and second region), each assigned a specific threshold value. This segmentation approach simplifies the management of location-specific thresholds by grouping similar sensitivity characteristics into regions, rather than managing individual thresholds for every possible location. The segmentation reduces computational complexity while maintaining sensitivity uniformity across the panel.
3Measurement precision
If continuous touch data calculation is performed for precise touch detection, then measurement precision is improved, but computational load increases and operating speed decreases
Solution Approach 1:
The patent applies partial action by using region-based thresholding instead of continuous calculation. The touch detection circuit compares touch data against pre-determined region-specific thresholds rather than performing continuous complex calculations. This partial computation approach maintains sufficient detection accuracy for practical purposes while significantly reducing computational load and improving processing speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances touch performance by compensating for sensitivity deviations, distinguishing between ground and non-ground states, and dynamically managing thresholds, thereby improving operating speed and accuracy.
Implementation Method 1
A touch panel generates capacitance between a touch driving electrode and a touch sensing electrode. A change in the capacitance may indicate the touch or proximity of an external object.
Data Source
AI summary
The present disclosure relates to a technology for sensing a touch input by differently adjusting a ratio of a threshold for each touch location, and can provide a technology for incorporating a difference between touch sensing sensitivity at the center of a touch area and touch sensing sensitivity in the periphery of the touch area by setting a threshold by incorporating a ratio of touch intensity at an offset location and touch intensity at an adjacent location.