Single Layer Self-Capacitance Touch Screen Multi-Touch Identification
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Solution Overview
Problem
Single layer self-capacitance touch screens struggle to realize multi-touch functionality due to limitations in calculating coordinate data for touch points on the same horizontal or vertical line, leading to defects in multi-touch identification.
Innovation Solution
The method employs multiple independent self-capacitance electrode assemblies in the same plane layer, with specific electrode plate configurations and data processing steps to detect and integrate self-capacitance change data, allowing for the differentiation of touch points across adjacent electrode assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single layer self-capacitance touch screen is used to reduce manufacturing cost and simplify electrode pattern, then manufacturing cost is reduced and electrode pattern is simplified, but multi-touch identification functionality is lost
Solution Approach 1:
The touch screen is divided into multiple independent self-capacitance electrode assemblies arranged in an array. Each assembly can independently detect touch events, enabling multi-touch identification while maintaining the single-layer simple electrode pattern structure that reduces manufacturing cost.
Solution Approach 2:
The patent introduces a new dimension of detection by measuring capacitance changes at multiple electrode assemblies simultaneously. By detecting capacitance variations across the array of electrode assemblies in different spatial positions, the system can distinguish between multiple touch points that would otherwise be indistinguishable in a conventional single-layer self-capacitance design.
2Device complexity
If conventional coordinate calculation methods are used for single layer self-capacitance touch screens, then calculation is simple, but touch points on the same horizontal or vertical line cannot be differentiated
Solution Approach 1:
The electrode structure is segmented into multiple independent assemblies arranged in an array. Each assembly independently calculates coordinate data based on its local capacitance changes, and the system integrates results from multiple assemblies to differentiate touch points that share the same horizontal or vertical coordinates.
Solution Approach 2:
The patent introduces an intermediary coordinate integration process that receives coordinate data from multiple electrode assemblies and resolves ambiguities. This intermediary processing layer combines information from different spatial positions to accurately differentiate touch points that would otherwise have identical coordinates in conventional systems.
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 approach enhances the single layer self-capacitance touch screen to achieve multi-touch identification while maintaining a low manufacturing cost and simplifying the electrode pattern, overcoming previous limitations in multi-touch functionality.
Implementation Method 1
single layer self-capacitance touch screen
Data Source
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AI summary
A single layer self-capacitance touch screen and its data processing method which can realize multi-touch identification, the said touch screen includes at least two self-capacitance electrode assemblies independent of each other, all of which are located in the same plane layer and fully cover the whole touch zone of the touch screen without overlapping each other; the said self-capacitance electrode assembly (11) includes at least a pair of self-capacitance coupling electrode couples (110), which include two electrode plates (111) seated in the same plane, and these two electrode plates all include their own straight-line electrode plate coupling side (1111) and straight-line electrode plate base (1112), which have included angle of acute angle; in the self-capacitance electrode assembly, the centre lines of the self-capacitance coupling electrode couples are placed parallel to each other, and the centre lines of arbitrarily two self-capacitance coupling electrode couples are also placed parallel to each other. This invention fully utilizes simple technological structure feature of single layer self-capacitance touch screen and realizes multi-point touch control function at possible lowest manufacturing cost.