Touch Panel Electrode Multiplexing for Pressure Detection
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Solution Overview
Problem
Existing 3D touch technologies increase panel thickness, complicate manufacturing, and reduce detection accuracy due to independent pressure and touch detection signals.
Innovation Solution
A touch panel design where touch electrodes function as both position and pressure detection electrodes, integrated with a piezoelectric material layer to form a sensing structure, allowing for simultaneous touch position and pressure detection without additional components, using a multiplexing circuit to avoid signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent pressure detection electrodes and touch detection electrodes are used, then pressure detection function is achieved, but panel thickness increases and manufacturing complexity increases
Solution Approach 1:
The touch electrode is designed to serve dual functions: it acts as both a touch detection electrode for position detection and as a pressure detection electrode for force sensing. This multi-functionality eliminates the need for separate independent pressure detection electrodes, thereby maintaining pressure detection capability while reducing panel thickness and manufacturing complexity
Solution Approach 2:
The patent combines the touch detection electrode and pressure detection electrode into a single integrated electrode structure. By merging these two previously separate components, the design achieves both touch position detection and pressure detection without increasing panel thickness or manufacturing complexity
2Reliability
If independent pressure and touch detection signals are used, then both detection functions are achieved, but signal interference occurs and detection accuracy decreases
Solution Approach 1:
The patent implements periodic action by alternately switching between touch detection mode and pressure detection mode through a switching circuit. During touch detection phase, the touch electrode functions as touch detection electrode; during pressure detection phase, it functions as pressure detection electrode. This time-division multiplexing eliminates signal interference between the two detection functions while maintaining high detection accuracy for both
3Reliability
If additional pressure detection components are added, then pressure detection capability is enhanced, but manufacturing complexity and production cost increase
Solution Approach 1:
The existing touch electrode structure is designed to serve dual purposes as both touch detection and pressure detection electrode, eliminating the need for additional pressure detection components. This approach maintains pressure detection capability while avoiding the increased manufacturing complexity and production costs that would result from adding separate pressure sensing layers or structures
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 design enhances integration, maintains panel thickness, simplifies manufacturing, reduces production costs, and improves detection accuracy by enabling simultaneous and accurate touch position and pressure detection.
Implementation Method 1
a piezoelectric material layer on the first detection electrode
Data Source
AI summary
A touch panel, a method of driving a touch panel, and a touch device are provided. The touch panel includes a first detection electrode, a piezoelectric material layer and a position touch structure. The piezoelectric material layer is on the first detection electrode. The position touch structure comprises a touch electrode or a plurality of touch electrodes and is on the piezoelectric material layer. The touch electrode or at least one of the plurality of touch electrodes is configured to function as a second detection electrode as well, and the second detection electrode together with the piezoelectric material layer and the first detection electrode constitutes a piezoelectric sensing structure for implementing a touch pressure detection.