Transparent Piezoelectric Sheet Asymmetric Electrode Frame Interference
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Solution Overview
Problem
Transparent piezoelectric sheets used for touch pressure detection face challenges in covering wide areas with high precision while avoiding interference from frames or casing edges, leading to reduced detection accuracy and increased manufacturing costs due to the need for precise alignment of electrodes.
Innovation Solution
The design involves transparent plate electrodes on both surfaces of the piezoelectric film, where the larger electrode coincides with the frame and the smaller electrode does not, allowing for reliable touch pressure detection across a wider area without interference, while maintaining a low manufacturing cost and aesthetically pleasing appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the transparent piezoelectric sheet is made to cover the entire detection-effective region of the touch panel, then the touch pressure detection area is maximized, but the frame or casing edge will interfere with the detection accuracy
Solution Approach 1:
The transparent piezoelectric sheet is divided into a detection region (where the smaller electrode is located) and a non-detection region (where the frame contacts the larger electrode). This segmentation allows the sheet to cover the entire detection-effective region while preventing frame interference in the detection area, thus maximizing detection area without sacrificing accuracy.
Solution Approach 2:
Different regions of the transparent piezoelectric sheet are assigned different functions: the central region contains the smaller electrode for accurate touch pressure detection, while the peripheral region contains the larger electrode that contacts the frame but is excluded from detection. This local differentiation resolves the contradiction between coverage area and detection accuracy.
2Measurement precision
If transparent plate electrodes are placed on both surfaces of the piezoelectric film to enable wide-area detection, then detection precision is improved, but manufacturing complexity increases due to alignment requirements
Solution Approach 1:
The transparent plate electrodes are designed with asymmetric sizes: a larger electrode and a smaller electrode. The smaller electrode is positioned within the detection-effective region while the larger electrode extends to the frame contact area. This asymmetric design simplifies manufacturing by providing a clear size differential that guides alignment, reducing the complexity of precise electrode positioning while maintaining detection precision in the smaller electrode region.
3Ease of manufacture
If the transparent piezoelectric sheet is designed with a frame for structural support and handling, then ease of manufacture is improved, but the frame contacts the piezoelectric sheet causing false detection signals
Solution Approach 1:
The detection function is extracted from the frame contact region and assigned exclusively to the smaller electrode in the detection-effective region. The larger electrode contacts the frame but is excluded from detection, effectively separating the structural support function (frame contact) from the detection function, thereby eliminating false detection signals while maintaining ease of manufacture.
Solution Approach 2:
The transparent piezoelectric sheet is segmented into a detection region (smaller electrode area) and a non-detection region (larger electrode area contacting the frame). This segmentation allows the frame to provide structural support and handling ease while the detection region remains isolated from frame interference, resolving the contradiction between manufacturing ease and signal accuracy.
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 configuration enables precise and wide-area touch pressure detection without frame interference, maintains low manufacturing costs, and ensures the transparent piezoelectric sheet-with-a-frame is superior in both functionality and appearance.
Implementation Method 1
a transparent piezoelectric sheet that comprises one transparent piezoelectric film (10) including an organic polymer
Data Source
AI summary
A transparent piezoelectric sheet-with-a-frame includes a transparent piezoelectric sheet and a frame covering a peripheral edge portion of the transparent piezoelectric sheet. The transparent piezoelectric sheet includes one transparent piezoelectric film including an organic polymer, one first transparent plate electrode placed on a first main surface of the transparent piezoelectric film and having a first transparent plate electrode portion, and one second transparent plate electrode placed on a second main surface of the transparent piezoelectric film and having a second transparent plate electrode portion. An outline of the second transparent plate electrode portion is positioned inside an outline of the first transparent plate electrode portion as seen in a plan view. The outline of the first transparent plate electrode portion completely coincides with the frame, and the outline of the second transparent plate electrode portion does not at all coincide with the frame as seen in the plan view.