Flexible Display Panel Insulating Structure for Fold-Area Adhesion
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Solution Overview
Problem
The poor adhesion between the organic and metal layers in flexible AMOLED display panels due to metal residues and water absorption leads to poor reliability and functionality issues, particularly affecting bending and folding performance.
Innovation Solution
Incorporating a first inorganic layer with lower structural stiffness in the bending area, which improves adhesion between the organic and metal layers, and includes filling parts to enhance bending and folding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional organic material layer is used in the touch layer, then the manufacturing process is simpler, but the adhesion between the organic material and metal layer is poor leading to metal residues and open circuits
Solution Approach 1:
The patent applies composite materials by introducing an inorganic material layer (such as silicon oxide, silicon nitride, or silicon oxynitride) combined with an organic material layer to form a multi-layer insulating structure. This composite structure improves adhesion between the organic layer and metal layer, preventing metal residues and open circuits while maintaining manufacturing feasibility through established semiconductor fabrication processes.
Solution Approach 2:
The inorganic material layer serves as an intermediary between the organic material layer and the metal layer. This intermediate layer facilitates better adhesion and prevents direct contact issues between the organic material and metal, thereby eliminating metal residues and open circuit problems without requiring complete restructuring of the touch layer.
2Reliability
If the inorganic layer has high structural stiffness, then the adhesion and structural integrity are improved, but the bending and folding performance of the display panel deteriorates
Solution Approach 1:
The patent applies local quality by positioning the high-stiffness inorganic material layer specifically in the flattening areas away from the bending area, while using lower-stiffness organic material layers in the bending area. This localized differentiation allows the display panel to maintain structural integrity in non-bending regions while achieving flexible bending and folding performance in the designated bending area.
Solution Approach 2:
The insulating layer is segmented into multiple layers with different material compositions and stiffness characteristics. The inorganic material layer provides structural support in specific regions, while organic material layers provide flexibility in bending regions, allowing the overall structure to achieve both integrity and flexibility through division of functional zones.
Data Source
AI summary
A display panel and a display equipment. The display panel has a bending area and flattening areas located on two sides of the bending area in a length direction of the display panel, and includes: a display structure layer; a first insulating layer located on a side of the display structure layer, the first insulating layer includes a first organic layer and a first inorganic layer that are stacked, the first inorganic layer includes a first body part and at least one first filling parts, structural stiffness of the first filling part is less than that of the first body part, and the first filling part is located in the bending area; and a touch layer located on a side of the first insulating layer away from the encapsulation layer.