Piezoelectric Touch Panel Pressure Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 3D touch technologies, such as force touch, face challenges in accurately detecting pressure and providing differentiated pressure feedback, which limits the complexity and effectiveness of touch experiences in consumer electronics.
Innovation Solution
A touch panel design incorporating a high-resistance first electrode, a piezoelectric layer, and a second electrode, where the piezoelectric layer generates charges upon pressure, and the second electrode couples these charges to output a touch signal, enabling sensitive pressure detection and feedback, while a conductive grid electrode and detector unit facilitate touch position and pressure recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional 3D touch technology is used, then touch pressure detection is implemented, but measurement precision and detection sensitivity are insufficient
Solution Approach 1:
The patent replaces conventional mechanical pressure sensing mechanisms with a piezoelectric effect-based detection system. The piezoelectric layer converts applied pressure directly into electrical charge signals, eliminating the need for complex mechanical pressure sensors and achieving higher precision pressure detection through electrostatic coupling.
Solution Approach 2:
The patent utilizes the piezoelectric effect to convert mechanical pressure parameters into electrical charge parameters. By measuring the generated charge signals from the piezoelectric layer, the system achieves precise pressure detection through parameter transformation from mechanical domain to electrical domain.
2Ease of manufacture
If a simplified touch panel structure is used, then manufacturing cost is reduced, but pressure detection sensitivity deteriorates
Solution Approach 1:
The patent merges the touch detection function with the display structure by integrating the piezoelectric layer directly into the display panel architecture. The second electrode serves dual purposes as both a touch sensing electrode and a display electrode, eliminating separate components and simplifying manufacturing while maintaining detection sensitivity.
Solution Approach 2:
The second electrode in the patent performs multiple functions: it serves as the sensing electrode for touch pressure detection, couples with the piezoelectric layer to detect charge signals, and simultaneously functions as a display electrode. This multi-functionality reduces component count and manufacturing complexity.
3Measurement precision
If the second electrode couples first charges effectively, then touch signal output is improved, but interference from static electricity and second charges increases
Solution Approach 1:
The patent extracts and separates the first charges generated by the piezoelectric layer from interfering charges through selective coupling. The second electrode is positioned and configured to couple primarily with the first charges from the piezoelectric layer while excluding static electricity and second charges, achieving signal purification.
Solution Approach 2:
The piezoelectric layer acts as an intermediary that selectively generates first charges in response to applied pressure. This intermediary mechanism converts mechanical pressure into specific electrical charges that can be coupled by the second electrode while naturally filtering out other interfering charge sources.
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
The solution provides a cost-effective and simplified structure for sensitive pressure touch detection, enhancing the touch experience by accurately recognizing touch positions and pressures, and integrating seamlessly with display functions without affecting the display.
Implementation Method 1
The piezoelectric layer is configured to generate first charges on a side thereof close to the second electrode upon being pressed
Data Source
AI summary
A touch panel and a driving method thereof, and a touch device are provided. The touch panel includes a first base substrate, a second base substrate, a first electrode, a piezoelectric layer and a second electrode. The second base substrate is opposite to the first base substrate. The first electrode is on a side of the first base substrate facing away from the second base substrate, and is configured to provide a reference. The piezoelectric layer is between the first electrode and the first base substrate. The second electrode is between the first base substrate and the second base substrate. The piezoelectric layer is configured to generate first charges on a side thereof close to the second electrode upon being pressed, and the second electrode is configured to couple the first charges at a pressed position and output a touch signal.