Flexible Display Panel Wiring with Organic Film for Bend Reliability
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Solution Overview
Problem
Flexible display panels face increased risk of wiring disconnection due to stress associated with bending, particularly because inorganic insulating films are susceptible to tensile stress, leading to cracks and insulation performance reduction.
Innovation Solution
The use of an organic insulating film covering the wiring on a flexible display panel, positioned on the surface of the base material, which is in contact with the wiring, reduces the risk of disconnection by distributing stress and preventing cracks, thereby enhancing insulation and mechanical durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic insulating film is used to cover the wiring, then insulation performance is improved, but the wiring becomes susceptible to tensile stress and cracks during bending
Solution Approach 1:
The patent replaces the rigid inorganic insulating film with a flexible organic insulating film that can accommodate bending stresses. This flexible film maintains insulation performance while preventing cracks during flexing of the display panel, directly resolving the contradiction between insulation and stress resistance.
Solution Approach 2:
The patent changes the material parameter from inorganic to organic insulating film, fundamentally altering the mechanical properties of the coating. This parameter change enables the insulating layer to transition from brittle and crack-prone to flexible and stress-resistant, solving the technical contradiction.
2Adaptability or versatility
If the display panel is made flexible by using a resin film base material, then adaptability and folding capability are improved, but the risk of wiring disconnection increases due to bending stress
Solution Approach 1:
The organic insulating film acts as a flexible protective layer that moves with the bending deformation of the resin base material. This flexible coating prevents stress concentration at the wiring interface, maintaining wiring connection stability while enabling folding capability.
Solution Approach 2:
The organic insulating film serves as an intermediary layer between the wiring and the flexible base material. It mediates the stress transfer during bending, protecting the wiring from direct tensile stress while maintaining the flexibility of the overall structure.
3Reliability
If the wiring surface is covered with an inorganic insulating film, then insulation performance is improved, but manufacturing complexity increases due to additional processing steps
Solution Approach 1:
The patent changes the deposition method parameter from physical vapor deposition (PVD) or chemical vapor deposition (CVD) required for inorganic films to solution-based coating methods suitable for organic films. This parameter change simplifies the manufacturing process while maintaining insulation performance.
Solution Approach 2:
The organic insulating film can be applied using simpler, more cost-effective coating techniques compared to inorganic films. This approach reduces manufacturing complexity and cost while providing sufficient insulation performance for the application.
Data Source
AI summary
In a display device including a flexible display panel, the risk of disconnection of a wiring due to bending is reduced. A display panel includes a display function layer including display elements and a wiring on one major surface of a base material having flexibility. The display panel includes, on the one major surface of the base material, an organic-film-covered wiring area where the surface of the wiring is covered with an organic planarization film that is an organic insulating film in direct contact with the wiring. The display panel includes, in the plane thereof, a display area where the display elements are arranged and a component mounting area that is a peripheral area located outside the display area. As the organic-film-covered wiring area, a curved area is provided in the peripheral area.