Flexible Electromagnetic Shielding for AMOLED Bending Areas
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Solution Overview
Problem
Existing electromagnetic shielding methods are not applicable to bending areas of active-matrix organic light-emitting diode (AMOLED) displays due to the fragility and thickness of AMOLEDs, which are easily damaged by conductive fabrics attached to their outer surfaces, and it is impractical to attach shielding to the inner surface with small bending angles.
Innovation Solution
A flexible display screen design featuring a flexible display panel with a first and second flexible electromagnetic shielding layer made of conductive materials with fluidity, positioned on opposite sides of the panel, including a colloidal insulating layer to absorb stress and prevent cracking, and a thinner bottom film in bending areas to facilitate bending without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conductive fabric is attached to the outer surface of the AMOLED for electromagnetic shielding, then electromagnetic shielding is improved, but the AMOLED is easily damaged due to pulling force during bending
Solution Approach 1:
The patent replaces rigid conductive fabric with flexible electromagnetic shielding films that can bend without exerting pulling force on the AMOLED. These thin film structures conform to the bending geometry while maintaining electromagnetic shielding functionality, eliminating the damage caused by traditional fabric attachments during bending operations.
Solution Approach 2:
The patent transitions from surface-attached fabric (2D attachment) to multi-layer film structures positioned at different depths within the display assembly. By distributing shielding layers across multiple dimensions and interfaces, the solution maintains shielding effectiveness without concentrating stress on the AMOLED surface during bending.
2Adaptability or versatility
If the AMOLED is made thin for flexibility, then flexibility is improved, but the AMOLED becomes fragile and easily damaged
Solution Approach 1:
The patent employs composite structures combining multiple thin layers including flexible display panels, electromagnetic shielding films, and protective encapsulation layers. Each layer is optimized for specific functions while collectively providing both flexibility and strength, allowing the thin AMOLED to maintain structural integrity during bending through the synergistic properties of the composite assembly.
Solution Approach 2:
The patent incorporates protective electromagnetic shielding films and encapsulation layers that are positioned and pre-configured to absorb and distribute mechanical stress before it reaches the fragile AMOLED. These protective layers act as cushioning elements that mitigate damage during bending operations while maintaining the thin profile necessary for flexibility.
3Illumination intensity
If the bending angle is small for the AMOLED, then display quality is maintained, but it is impractical to attach conductive fabric on the inner surface
Solution Approach 1:
The patent uses flexible electromagnetic shielding films that can conform to small bending angles and complex curved surfaces of the AMOLED. These thin films can be applied to inner surfaces and follow the geometry of the display panel during bending, making them practical for attachment in configurations where traditional fabric would be impossible to install while maintaining display quality.
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
The solution effectively protects the bending area of the flexible display panel from cracking and disconnection while providing electromagnetic shielding to the signal lines, ensuring reliable operation during bending processes.
Implementation Method 1
Due to the fluidity of the first flexible electromagnetic shielding layer and the second flexible electromagnetic shielding layer, the stress of the display screen in the bending process can be absorbed favorably
Implementation Method 2
the first flexible electromagnetic shielding layer and the second flexible electromagnetic shielding layer can electromagnetically shield the signal line of the bending area
Data Source
AI summary
The present invention discloses a flexible display screen and a display device. The flexible display screen includes: a flexible display panel, a first flexible electromagnetic shielding layer and a bottom film disposed in that order on a side, opposite to a light-emitting side, of the flexible display panel; the organic electroluminescent flexible display panel has a bending area, and the bending area is provided with signal lines; the flexible display screen further includes: a second flexible electromagnetic shielding layer disposed on a light-emitting side of the flexible display panel and covering the signal lines, and a colloidal insulating layer covering the second flexible electromagnetic shielding layer; and the materials of the first flexible electromagnetic shielding layer and the second flexible electromagnetic shielding layer are both conductive materials with fluidity.