Transparent Piezoelectric Sheet with Partial Electrodes
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Solution Overview
Problem
Transparent piezoelectric sheets used for touch pressure detection face challenges in achieving wide effective area coverage and high precision while avoiding interference from frames or casing edges, leading to increased manufacturing costs and reduced detection accuracy.
Innovation Solution
A quadrilateral-shaped transparent piezoelectric film with organic polymer and partial transparent plate electrodes on its surfaces, where one to three sides are not covered by the electrodes, allowing for accurate alignment and large-area detection without frame interference, enabling high precision and cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If transparent plate electrodes cover the entire main surfaces of the transparent piezoelectric film to enable wide-area touch pressure detection, then the effective detection area is increased, but the manufacturing cost increases and alignment difficulty increases
Solution Approach 1:
The patent divides the transparent piezoelectric film into multiple regions with different electrode configurations. Specifically, the film includes a first region with first transparent plate electrodes, a second region with second transparent plate electrodes, and a third region without transparent plate electrodes. This segmentation allows the effective detection area to be sufficiently large while reducing the total electrode area and manufacturing complexity, thereby lowering costs.
Solution Approach 2:
The patent applies different structural characteristics to different regions of the transparent piezoelectric film. The first and second regions have transparent plate electrodes for touch pressure detection, while the third region deliberately lacks electrodes to serve as a reference area. This local differentiation optimizes the overall system performance by having specialized zones for detection and reference, improving both effectiveness and manufacturability.
2Measurement precision
If transparent plate electrodes cover the entire main surfaces to improve detection precision, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the transparent piezoelectric film into distinct functional regions: detection regions (first and second regions with electrodes) and a reference region (third region without electrodes). This segmentation enables precise touch pressure measurement in the detection regions while using the electrode-free third region as a stable reference, thereby achieving high measurement precision without requiring electrodes across the entire surface, which would increase complexity.
Solution Approach 2:
The third region without transparent plate electrodes serves as an intermediary reference element. By providing an area free from electrode interference, it acts as a mediator that enables accurate comparison and calibration for touch pressure detection in the other regions, thereby improving measurement precision without adding the complexity of full-surface electrode coverage.
3Ease of manufacture
If the transparent piezoelectric sheet is made smaller to reduce manufacturing costs, then ease of manufacture is improved, but the effective area for touch pressure detection is reduced
Solution Approach 1:
The patent segments the transparent piezoelectric film into multiple functional regions, allowing the effective detection area (first and second regions with electrodes) to be optimized independently of the total film size. The third region without electrodes can be adjusted in size and position to accommodate manufacturing constraints while maintaining sufficient detection area in the other regions, thus resolving the contradiction between manufacturing ease and detection area.
Solution Approach 2:
The patent applies different functional qualities to different regions of the film. The first and second regions are optimized for touch pressure detection with appropriate electrode coverage, while the third region is optimized as an electrode-free reference area. This local optimization allows the overall device to achieve cost-effective manufacturing while maintaining sufficient effective detection area in the specialized detection regions.
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 enables wide-area touch pressure detection with high precision and low manufacturing costs, maintaining transparency for easy alignment and integration with touch panels and electronic devices.
Implementation Method 1
a transparent piezoelectric sheet, and a transparent piezoelectric sheet-with-a-frame, a touch panel, and an electronic device each having the transparent piezoelectric sheet
Data Source
AI summary
A transparent piezoelectric sheet includes a quadrilateral-shaped transparent piezoelectric film and a first transparent plate electrode. The quadrilateral-shaped transparent piezoelectric film includes an organic polymer. The quadrilateral-shaped transparent piezoelectric film has entire main surfaces that are piezoelectric. The first transparent plate electrode is layered on part of a first main surface of the main surfaces of the transparent piezoelectric film. One to three sides of the four sides of the quadrilateral shape of the transparent piezoelectric film and area(s) of the first main surface adjacent thereto are not covered by the first transparent plate electrode.