Touch Sensing Device Flatness Index Verification
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Solution Overview
Problem
Conventional touch sensing devices inaccurately determine touch status when the touch sensing panel is covered by an external object for a long period, leading to false reference data usage.
Innovation Solution
A method that processes 2D sensing information to create local data sets and computes flatness indexes, comparing them against predetermined reference values to identify abnormal conditions, repeatedly updating data until all indexes fall within a normal range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the processor continuously updates 2D sensing information during startup, then the touch sensing device can quickly establish reference data, but it may incorrectly use abnormal data (when the panel is covered by external objects) as reference data
Solution Approach 1:
The patent applies preliminary action by performing flatness index verification before finalizing the reference 2D sensing information. The processor checks whether the panel surface is normal (not covered by external objects) before accepting the measured capacitive coupling amounts as valid reference data. This preliminary check prevents abnormal data from being incorrectly stored, resolving the contradiction between quick startup and data accuracy.
2Device complexity
If the processor uses measured capacitive coupling amounts directly as reference data, then the system operates efficiently with minimal processing, but it cannot distinguish between normal and abnormal sensing conditions
Solution Approach 1:
The patent introduces an intermediary mechanism - the flatness index calculation and verification system - that mediates between the raw capacitive coupling measurements and the final reference data storage. This intermediary layer analyzes the spatial distribution of sensing values to determine whether the panel surface is normal, thereby enabling the system to distinguish between normal and abnormal conditions without excessive complexity.
3Adaptability or versatility
If the system repeatedly updates reference data during startup, then it can adapt to changing conditions quickly, but it may repeatedly store abnormal data if the panel remains covered
Solution Approach 1:
The patent implements feedback by continuously monitoring the flatness index during the startup process and using this information to control whether reference data should be updated. If the panel surface is found to be abnormal (covered by external objects), the system receives feedback to prevent updating the reference data, even if multiple startup attempts are made. This feedback mechanism ensures that abnormal conditions do not lead to repeated storage of invalid reference data.
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
Ensures accurate touch sensing control by preventing the use of abnormal data as reference, maintaining reliable touch sensing performance.
Implementation Method 1
the driving and sensing circuit A12 of the touch sensing device A1 measures the capacitive coupling amount C (such as the capacitance value, current value, voltage value or amount of electrical charge) at each of all the sensing points A113 between the driving lines A111 and sensing lines A112
Data Source
AI summary
A touch sensing device and 2D sensing information update method used therein is disclosed. Before updating the 2D sensing information for use as a reference 2D sensing information, the processor determines the touch sensing panel is under an abnormal condition if any flatness index is smaller than a predetermined flatness index negative reference value or larger than a predetermined flatness index positive reference value, and will then keep measuring the capacitive coupling amount at each sensing point and getting respective flatness indexes, and will then update the 2D sensing information for use as a reference 2D sensing information when all the flatness indexes are in the range between the predetermined flatness index negative reference value and the predetermined flatness index positive reference value.