Flexible OLED Display With Curved Electrodes for Multi-Function Sensing
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Solution Overview
Problem
Current flexible display technologies lack integrated functionalities such as fingerprint recognition, bending position detection, and angle detection, which are essential for advanced user interaction and durability assessment.
Innovation Solution
A flexible OLED display substrate incorporating a pinhole array, curved electrodes made of resistance strain material, and detecting lines that allow for simultaneous fingerprint recognition, bending position, and angle detection, utilizing a shielding layer with integrated resistance strain material to change electrical resistance with deformation, enabling accurate detection of touch, force, and bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate components are added for fingerprint recognition, bending detection, and angle detection, then the detection functionality is improved, but the device complexity and thickness increase
Solution Approach 1:
The patent merges fingerprint recognition electrodes, bending detection electrodes, and angle detection electrodes into a single integrated electrode structure. The curved electrodes serve multiple functions simultaneously: they enable fingerprint recognition through capacitive sensing, detect bending positions through resistance changes, and measure angles through voltage distribution patterns. This consolidation eliminates the need for separate sensor components and reduces overall device complexity.
Solution Approach 2:
The electrode structure is designed with universal functionality to perform multiple detection tasks. The same curved electrodes that define the display shape also serve as sensors for fingerprint recognition, bending detection, and angle measurement. This multi-functional design allows a single component to replace what would traditionally require multiple separate sensors, thereby reducing device complexity while maintaining comprehensive detection capabilities.
2Measurement precision
If multiple separate components are added for fingerprint recognition, bending detection, and angle detection, then the detection functionality is improved, but the thickness and manufacturing cost increase
Solution Approach 1:
The patent combines multiple detection functions into a single electrode layer, eliminating the need for separate sensor components. The curved electrodes are formed in the same manufacturing process as the display electrodes, using the same conductive material deposited in the same layer. This merging approach reduces the total quantity of materials required and simplifies the manufacturing process by reducing the number of deposition and alignment steps.
Solution Approach 2:
The electrode structure is designed to serve multiple purposes: display function, fingerprint recognition, bending detection, and angle sensing. By making the electrodes universal rather than specialized, the patent reduces the total material quantity needed compared to having separate dedicated components for each function. The same conductive material and layer structure fulfill multiple roles, reducing both material consumption and manufacturing complexity.
3Adaptability or versatility
If curved electrodes are used for multi-function detection, then the integration level is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The curved electrode is divided into multiple curved sub-electrodes that are connected in series. Each sub-electrode corresponds to a specific detection zone or function. This segmentation allows for independent optimization and simplifies the manufacturing process by breaking down the complex curved structure into manageable segments that can be fabricated with standard precision tolerances. The series connection maintains the overall functionality while reducing individual fabrication difficulties.
Solution Approach 2:
The patent employs resistance strain material for the curved electrodes, which changes its electrical resistance in response to mechanical deformation. This parameter change provides an inherent sensing mechanism that works passively without requiring additional active components. The resistance change naturally indicates bending position and angle, reducing the need for complex active sensing circuits and lowering manufacturing precision requirements for additional components.
4Measurement precision
If resistance strain material is used in the shielding layer, then the bending detection accuracy is improved, but the material selection complexity increases
Solution Approach 1:
The resistance strain material provides a direct correlation between mechanical strain and electrical resistance, creating a passive sensing mechanism. This parameter change approach simplifies material selection because the resistance strain effect is a fundamental property of many conductive materials, requiring no exotic or specialized materials. The effect works automatically with standard conductive materials used in display manufacturing, maintaining ease of manufacture while achieving accurate bending detection.
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
Enables a flexible OLED display that can function for fingerprint recognition, touch detection, and bending angle assessment, enhancing user interaction and durability evaluation, while reducing thickness and manufacturing costs by integrating these functionalities into a single layer.
Implementation Method 1
curved electrodes made of resistance strain material, and detecting lines that allow for simultaneous fingerprint recognition, bending position, and angle detection, utilizing a shielding layer with integrated resistance strain material to change electrical resistance with deformation
Data Source
AI summary
The present application relates to the field of display technologies, and in particular, to display substrate devices. One of the described display substrates comprises: a flexible substrate; a pinhole array configured to transmit light on the flexible substrate; at least one curved electrode responsive to bending of the flexible substrate around the pinhole array on the flexible substrate; and a plurality of detecting lines; wherein the at least one curved electrode comprises a plurality of curved sub-electrodes connected in series; and at least one of the plurality of curved sub-electrodes is coupled to one of the plurality of detecting lines.