Piezoelectric Film End-Surface Coating for Electrode Isolation
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Solution Overview
Problem
Piezoelectric films used in thin and flexible displays are prone to short circuits due to electrode protrusions from the piezoelectric layer, which impairs their functionality.
Innovation Solution
A piezoelectric film configuration with insulating end surface coating layers covering the laminated structure, conductive connection members, and lead-out electrodes, along with insulating interlayer insulation members, to prevent short circuits and ensure proper operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the piezoelectric layer is made extremely thin to achieve thin and flexible displays, then the flexibility and thinness of the display are improved, but the risk of short circuit between electrode layers increases due to electrode protrusions
Solution Approach 1:
An insulating coating layer is applied to the end surfaces of the piezoelectric layer to act as an intermediary barrier between protruding electrode layers, preventing direct contact and short circuits while allowing the piezoelectric layer to remain extremely thin for flexible display applications
Solution Approach 2:
The solution moves from a two-dimensional planar structure to a three-dimensional laminated structure by adding insulating coating layers on the end surfaces, creating additional protective dimension that prevents short circuits without increasing the thickness of the functional piezoelectric layer
2Adaptability or versatility
If electrode layers are formed on both surfaces of the piezoelectric layer to enable electroacoustic conversion, then the functionality of the piezoelectric film is improved, but the risk of short circuit between electrodes increases
Solution Approach 1:
The insulating coating layer serves as a mediator between the two electrode layers, allowing both to be present on opposite surfaces of the piezoelectric layer for electroacoustic conversion while preventing direct electrical contact through protrusions at the edges
Solution Approach 2:
The piezoelectric film becomes a composite laminated structure combining conductive electrode layers with insulating coating layers, where each material performs its specific function - electrodes for electrical conduction and electroacoustic conversion, and insulating coating for electrical isolation
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
Prevents short circuits and maintains the functionality of piezoelectric films, allowing them to be integrated into thin and flexible displays without compromising flexibility or sound quality.
Implementation Method 1
a sheet-like piezoelectric film having flexibility and a property of stretching and contracting in response to an applied voltage
Data Source
AI summary
An object of the present invention is to provide a piezoelectric film capable of preventing a short circuit caused by electrodes protruding from a piezoelectric layer in the piezoelectric film having electrode layers and protective layers on both surfaces of the piezoelectric layer, and a method of producing the piezoelectric film. The object can be achieved by the piezoelectric film that includes a laminated film including a piezoelectric layer, an electrode layer provided on each of both surfaces of the piezoelectric layer, and a protective layer covering the electrode layer, and an insulating end surface coating layer which covers at least a part of an end surface of the laminated film.