Touch Area Positioning via Differential Signal Expansion
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Solution Overview
Problem
Existing touch area positioning methods, such as peak point and boundary positioning, suffer from inaccuracies in identifying large and small touch points, leading to low accuracy in capacitive touch devices.
Innovation Solution
A method that involves determining first and second touch areas based on differential signals and a preset threshold, expanding the area around sensing units with maximum and minimum differential signals, and combining these areas to obtain a target touch area, improving accuracy by separately identifying sensing units with positive and negative differential signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If peak point positioning method is used, then the method is simple to implement, but the accuracy of identifying large touch points deteriorates
Solution Approach 1:
The patent segments the touch area identification process into multiple stages: initial touch area determination using peak point method, boundary expansion phase, and merging phase. This segmentation allows the system to use the simple peak point method for initial identification while adding subsequent steps to improve accuracy for large touch areas without overwhelming complexity
Solution Approach 2:
The patent performs preliminary action by first identifying the initial touch area using the simple peak point method, then uses this result as a foundation for subsequent boundary expansion and merging operations. This preliminary identification provides a starting point that simplifies the overall process while enabling more accurate final positioning
2Measurement precision
If boundary positioning method is used, then large touch areas can be identified, but the method becomes complex and inadequate for small touch points
Solution Approach 1:
The patent applies dynamics by making the positioning method adaptive to different touch sizes. The system dynamically adjusts the boundary expansion radius based on the initial touch area size and performs selective merging operations. This dynamic approach maintains accuracy for large touch areas while simplifying the process for small touch points, reducing overall complexity
Solution Approach 2:
The patent implements local quality by applying different processing strategies to different regions of the touch sensing array. For each detected peak point, the system locally expands boundaries and merges only with adjacent touch areas that meet specific criteria. This localized approach improves accuracy where needed while avoiding unnecessary complexity in other regions
3Productivity
If traditional positioning methods are used, then the processing speed is fast, but the accuracy for both large and small touch points deteriorates
Solution Approach 1:
The patent performs preliminary action by quickly identifying the initial touch area using the peak point method, which maintains fast processing speed. This preliminary result is then used as a foundation for subsequent boundary expansion and merging operations, ensuring that the majority of processing is based on already-acquired information, thus preserving speed while improving accuracy
Solution Approach 2:
The patent segments the processing into distinct phases: fast peak point identification, boundary expansion, and merging. Each phase processes only the necessary data for that specific step, avoiding redundant computations. This segmentation maintains overall processing speed while enabling more accurate final positioning through the additional refinement steps
Data Source
AI summary
The present application relates to the field of touch, and in particular, relates to a positioning method and apparatus for a touch area, a terminal device, and a storage medium. The method comprises: determining a first touch area and a second touch area based on differential signals of first sensing units and a preset touch threshold, determining a second sensing unit and a third sensing unit in the first touch area and the second touch area separately, expanding the area where the second sensing unit is located and the area where the third sensing unit is located separately to obtain a third touch area and a fourth touch area, and combining the third touch area and the fourth touch area.