Flexible Display Panel Wiring Structure for Bend-Induced Signal Continuity
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Solution Overview
Problem
In flexible organic semiconductor display modules, metal wires in the non-display area often break during the bending process, leading to signal interruption due to the use of brittle inorganic insulating materials and inadequate protection.
Innovation Solution
A display panel design featuring a substrate with a metal wiring layer, a planarization layer with grooves exposing the metal wiring, and a flexible electrode layer filling these grooves, made from materials like silver nanowires or graphene, which reduces the risk of breakage and ensures continuous signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brittle inorganic insulating materials are used in the non-display area, then insulation performance is improved, but metal wires are prone to breakage during bending
Solution Approach 1:
The planarization layer is segmented by forming grooves that expose portions of the metal wiring layer, creating discrete segments rather than a continuous rigid structure. This segmentation allows the metal wiring to flex independently in the grooves, preventing breakage during bending while maintaining insulation in the covered portions.
Solution Approach 2:
The planarization layer is designed as a thin film structure with grooves rather than a solid rigid layer. This thin film configuration with exposed metal portions allows the structure to be flexible and adapt to bending, solving the contradiction between insulation performance and flexibility.
2Reliability
If the planarization layer completely covers the metal wiring layer, then insulation is improved, but signal transmission continuity is compromised when metal wires break
Solution Approach 1:
The flexible electrode layer is formed in advance within the grooves to provide a backup signal transmission path before any potential wire breakage occurs. This redundant pathway ensures that if the metal wiring layer breaks, signals can still be transmitted through the flexible electrode layer, maintaining continuity without requiring complex real-time monitoring or switching systems.
Solution Approach 2:
The flexible electrode layer acts as an intermediary backup pathway between the metal wiring layer and the final signal destination. When the metal wiring layer fails, the flexible electrode layer mediates the signal transmission, ensuring continuity without requiring direct reconfiguration of the entire wiring system.
3Reliability
If grooves are formed to expose metal wiring and flexible electrode layer is added, then wire breakage resistance is improved, but manufacturing process complexity increases
Solution Approach 1:
The grooves are formed in the planarization layer during the manufacturing process before final assembly, and the flexible electrode layer is pre-formed to fit within these grooves. This preliminary preparation of the structural features simplifies subsequent assembly steps and ensures proper alignment, reducing overall manufacturing complexity despite the additional process steps.
Solution Approach 2:
The flexible electrode layer is selectively placed only in the grooves where metal wiring is exposed, rather than being applied uniformly across the entire surface. This localized application reduces material usage and simplifies the manufacturing process by focusing the complex structure only where needed for bending durability.
Data Source
AI summary
The present disclosure discloses a display panel, a method for preparing the display panel, and a display device. The display panel is divided into a display area and a non-display area. The display panel in the non-display area includes: a substrate; a metal wiring layer arranged on the substrate, the metal wiring layer including metal wirings; a planarization layer covering the substrate and the metal wiring layer, the planarization layer being provided with grooves corresponding to the metal wirings, and the grooves each being located on a side, facing away from the substrate, of a metal wiring corresponding to the each groove and exposing the metal wiring; and a flexible electrode layer filling the grooves, the flexible electrode layer being coupled to the metal wiring layer located at bottoms of the grooves.