Flexible Display Panel Bending Detection via Interdigital Capacitors
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Solution Overview
Problem
Conventional foldable and bendable display screens require external bending sensors, which increase thickness and manufacturing complexity, and costs.
Innovation Solution
Integration of interdigital capacitors within the flexible display panel, disposed in the same layer as conductive layers, to sense bending states by changing capacitance, eliminating the need for external sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If external bending sensors are added to detect bending states, then detection capability is improved, but device thickness and structural complexity increase
Solution Approach 1:
The patent combines the bending detection function with the existing conductive layers of the flexible display panel by forming interdigital capacitors using the same conductive layers. This integration eliminates the need for separate external bending sensors, thereby maintaining detection capability while reducing device complexity and thickness.
Solution Approach 2:
The conductive layers in the flexible display panel serve dual purposes: they function as standard conductive elements for display operation and simultaneously serve as the sensing elements for bending detection through the interdigital capacitor structure. This multi-functionality resolves the contradiction by using existing components for additional detection functionality.
2Measurement precision
If external bending sensors are integrated into the display panel, then bending detection accuracy is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The interdigital capacitors are formed using the same conductive layers that are already part of the flexible display panel structure. This merging of detection functionality with existing manufacturing processes eliminates the need for separate sensor fabrication steps, thereby maintaining detection accuracy while simplifying manufacturing and reducing costs.
Solution Approach 2:
The flexible display panel's own conductive layers provide the sensing functionality without requiring external sensor components. The panel structure itself serves the dual purpose of display and sensing, eliminating the need for additional manufacturing steps associated with integrating separate bending sensors.
3Length of moving object
If interdigital capacitors are integrated within the same layer as conductive layers, then device thickness is reduced, but manufacturing precision requirements increase
Solution Approach 1:
By forming the interdigital capacitors within the same conductive layers already present in the flexible display panel, the patent eliminates the need for additional separate sensor layers. This integration maintains thin profile while utilizing existing layer structures, thereby reducing the impact on manufacturing precision requirements compared to adding separate sensor layers.
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 approach reduces the thickness and manufacturing complexity of flexible display panels while enhancing detection sensitivity and accuracy of bending states without adding external components.
Implementation Method 1
at least one interdigital capacitor disposed in the at least one overlapping area... sensing portion connected to the plurality of interdigital fingers, an extending direction of the bending sensing portion crossing the extending direction of the bending axis of the bending area
Data Source
AI summary
A flexible display panel has a display area, a peripheral area surrounding the display area, and a bending area having at least one overlapping area with the peripheral area. The flexible display panel includes a plurality of conductive layers disposed in the display area, and at least one interdigital capacitor disposed in the at least one overlapping area. One of the at least one interdigital capacitor is disposed in a same layer with a same material as one of the plurality of conductive layers.