Flexible Display Sensing Bending Position via Piezoelectric Layer
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Solution Overview
Problem
Current input devices for portable terminals are limited in providing user convenience, especially as the number of application programs increases, necessitating an improved input method that can recognize user commands through positional or shape changes.
Innovation Solution
A flexible flat panel display device incorporating a matrix of pixel devices and sensing devices, where the sensing devices utilize a piezoelectric layer with electrodes and transparent conductive materials to detect bending or deformation, allowing the device to recognize user input through changes in position or shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch screen panel is applied to a flat panel display device, then user input convenience is improved, but the device complexity increases due to additional layers and components
Solution Approach 1:
The patent combines the display function and sensing function into a single integrated structure. The pixel devices and sensing devices share the same substrate and are fabricated using similar processes, merging two previously separate functions into one unified device architecture.
Solution Approach 2:
The flat panel display device is designed to perform multiple functions simultaneously: it serves as both a display device (through pixel devices) and a sensing device (through sensing devices with piezoelectric layers). This multi-functional design allows the same device to provide both visual output and tactile input capabilities.
2Adaptability or versatility
If sensing devices with piezoelectric layers are integrated into the flat panel display device, then the ability to recognize user commands through position or shape changes is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The device is segmented into distinct functional regions: pixel devices for display and sensing devices for input detection. Each segment is independently designed and fabricated, allowing specialized optimization for its specific function while maintaining overall integration on a single substrate.
Solution Approach 2:
The piezoelectric layer thickness is optimized within a specific range (0.1-0.3 μm) to achieve appropriate sensitivity for detecting user input while maintaining compatibility with standard manufacturing processes. This parameter optimization balances sensing performance with manufacturability.
3Adaptability or versatility
If the piezoelectric layer thickness is reduced to improve flexibility, then the device adaptability is improved, but the sensing precision may deteriorate
Solution Approach 1:
The piezoelectric layer thickness is optimized within a specific range (0.1-0.3 μm) to achieve appropriate sensitivity for detecting user input while maintaining compatibility with standard manufacturing processes. This parameter optimization balances sensing performance with manufacturability.
Solution Approach 2:
The sensing device uses a composite structure with the piezoelectric layer sandwiched between two electrodes. This composite design allows the thin piezoelectric layer to maintain adequate sensing capability while providing the necessary flexibility for the overall device structure.
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
Enhances user input convenience by accurately sensing the bending position and shape of the device, thereby improving the functionality and usability of portable terminals.
Implementation Method 1
a piezoelectric layer disposed on the first electrode
Data Source
AI summary
A flat panel display device includes a plurality of scan lines elongated in a direction, a plurality of data lines elongated to intersect the scan lines, a plurality of pixel devices respectively coupled to the plurality of scan lines and the plurality of data lines, a plurality of first sensing lines elongated parallel to the scan lines, a plurality of second sensing lines elongated parallel to the data lines, and a plurality of sensing devices respectively coupled to the plurality of first sensing lines and the plurality of second sensing lines.