Piezoelectric Sheet Touch Panel Layer Reduction
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Solution Overview
Problem
Conventional touch panels for detecting touch position and pressure are complex in structure, costly, and have poor visibility due to multiple layers, which increases weight and volume, making them unsuitable for portable devices and affecting mechanical strength against vibration or shock.
Innovation Solution
A piezoelectric sheet with a simple structure comprising a piezoelectric layer and two conductive layers, one on each surface with an insulating layer in between, allowing for the detection of touch position and pressure using a surface-capacitive system, reducing the number of layers and enhancing visibility and portability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional touch panels use multiple layers for detecting touch position and pressure, then detection precision is improved, but device complexity increases and visibility deteriorates
Solution Approach 1:
The patent combines touch position detection and touch pressure detection into a single integrated structure. The piezoelectric sheet integrates the piezoelectric layer with first and second conductive layers on opposite surfaces, allowing both detection functions to be performed by one component rather than requiring separate sensor layers and electrode structures.
Solution Approach 2:
The piezoelectric sheet serves multiple functions simultaneously: it acts as both the sensing element for touch position detection and the pressure detection element. The first conductive layer functions as both an electrode for position detection and a structural component, eliminating the need for separate dedicated layers for each detection type.
2Measurement precision
If conventional touch panels use multiple layers for detecting touch position and pressure, then detection precision is improved, but weight increases
Solution Approach 1:
The patent combines touch position detection and touch pressure detection into a single integrated structure. The piezoelectric sheet integrates the piezoelectric layer with first and second conductive layers on opposite surfaces, allowing both detection functions to be performed by one component rather than requiring separate sensor layers and electrode structures.
3Measurement precision
If conventional touch panels use multiple layers for detecting touch position and pressure, then detection precision is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent employs a piezoelectric film as the core sensing element, which is a thin flexible layer capable of withstanding vibration and shock. The film structure provides the necessary mechanical strength while maintaining the detection precision, replacing the need for multiple rigid layers that would compromise structural integrity.
4Measurement precision
If conventional touch panels use multiple layers for detecting touch position and pressure, then detection precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines touch position detection and touch pressure detection into a single integrated structure. The piezoelectric sheet integrates the piezoelectric layer with first and second conductive layers on opposite surfaces, allowing both detection functions to be performed by one component rather than requiring separate sensor layers and electrode 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
The solution provides a lightweight, cost-effective, and robust touch panel with improved visibility and mechanical strength, capable of detecting touch position and pressure with high precision and flexibility, suitable for portable devices.
Implementation Method 1
Piezoelectric effect (Piezoelectricity) is a phenomenon of electrical polarization (electrical charge on surface) generated at the time of affecting mechanical strain to a substance. The generated electric potential is proportional to a magnitude of strain and the polarity corresponds to a direction of strain.
Implementation Method 2
This phenomenon is reversible. When the same substance is electrically polarized by applying electric field to it, mechanical strain generates, or transforms the substance in proportion with a magnitude of the polarization.
Data Source
AI summary
Disclosed is an active matrix liquid crystal display device with transverse electric field system, which improves afterimage. One electrode of many pixel comb electrodes is thicker in width than the other pixel comb electrode and common comb electrodes and is equal to a width of the common shield electrode covering through a second insulator film on video signal wirings. The display area is divided into two sub areas by the thick pixel comb electrode. The pixel comb electrode and the common comb electrode have the same number in each sub area. As the common shield electrode and the thick pixel comb electrode have the same width, the concentration of electric field can be eased near the pixel comb electrodes. The electric potential distribution becomes symmetric by symmetric configuration, reducing asymmetric lighting mode between frames. DC offset of the video signal after flicker adjustment decreases and the afterimage improves.