Ferromagnetic Touch Layer for Flexible AMOLED Signal Interference
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Solution Overview
Problem
Current touch display panels, particularly flexible AMOLEDs, suffer from low touch sensitivity due to signal interference when bending, as the sensing capacitance generated by a finger is often smaller than the self-inductance capacitance, leading to unrecognized touch positions and reduced sensitivity.
Innovation Solution
A touch display panel with a touch layer comprising a ferromagnetic electrode layer and a signal conversion layer, where the ferromagnetic material BiFeO3 is grown using pulsed laser technology or molecular beam epitaxy, converting magnetic signals into electrical signals via a Hall element, allowing for improved touch recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitive touch method is used in flexible AMOLED, then touch control function is achieved, but touch sensitivity is low due to signal interference when bending
Solution Approach 1:
The patent replaces the conventional capacitive touch detection method with a magnetic field-based detection method. Instead of measuring capacitance changes caused by finger contact, the system uses a ferromagnetic material layer that responds to the magnetic field generated by the human body, converting magnetic field changes into detectable signals. This substitution eliminates the signal interference problem that occurs during bending in capacitive systems.
Solution Approach 2:
The patent changes the detection parameter from electrical capacitance to magnetic field intensity. By using a ferromagnetic material layer and detecting magnetic field changes rather than capacitance changes, the system achieves higher sensitivity and immunity to bending-induced interference. The ferromagnetic material's magnetic properties provide a more reliable detection mechanism under flexible conditions.
2Shape
If sensing capacitance is smaller than self-inductance capacitance, then flexible AMOLED structure is maintained, but touch position recognition fails
Solution Approach 1:
The patent replaces capacitive measurement with magnetic field measurement. The ferromagnetic material layer detects changes in magnetic field intensity caused by human body proximity, providing accurate touch position recognition without requiring large sensing capacitance values. This substitution enables reliable detection in flexible AMOLED structures where sensing capacitance is inherently small.
Solution Approach 2:
The ferromagnetic material layer acts as an intermediary between the human body and the detection system. It converts the magnetic field generated by the human body into measurable magnetic signal changes, enabling indirect but accurate detection of touch events. This intermediary mechanism overcomes the limitation of small sensing capacitance in flexible displays.
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 touch sensitivity by converting biomagnetic signals from human touch into electrical signals, enabling accurate touch position determination and feedback, even when the panel is bent.
Implementation Method 1
material of the electrode layer comprises a ferromagnetic material
Implementation Method 2
the signal conversion layer is configured to convert a magnetic signal into an electrical signal
Data Source
AI summary
A touch display panel, a manufacturing method thereof, and a touch display device are provided. The touch display panel includes a driving circuit layer, a light-emitting functional layer, an encapsulation layer, and a touch layer stacked on the substrate. The touch layer includes an electrode layer and a signal conversion layer. The electrode layer is formed by growing a ferromagnetic material on the encapsulation layer. The signal conversion layer is configured to convert a change of a magnetic signal at a touch position into an electrical signal. An interaction between a human bioelectricity and the touch layer is used to improve touch sensitivity.