Pixel-Spacing Metal Fill Structure for Impact-Resistant Displays
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Solution Overview
Problem
Display devices face challenges in maintaining robustness against external impacts and preventing impurities from permeating, particularly due to increasing integration and complexity of electronic elements, which can lead to defects and reduced reliability.
Innovation Solution
The display device incorporates a metal layer between pixel areas, an inorganic insulating layer with grooves exposing the metal layer, and an organic insulating layer filling these grooves, along with a barrier layer to prevent impurity penetration and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a metal layer is disposed between pixel areas to enhance structural integrity and serve as an etch stop, then manufacturing precision of groove depth is improved, but device complexity increases due to additional layers and processing steps
Solution Approach 1:
The metal layer is formed in advance before the insulating layers are deposited, serving as a pre-established etch stop layer. This preliminary action ensures that subsequent etching processes automatically stop at the metal layer, guaranteeing consistent groove depth without requiring complex real-time monitoring or multiple etching steps.
Solution Approach 2:
The metal layer acts as an intermediary between the substrate and the insulating layers, providing a functional interface that controls the etching process. This intermediary layer simplifies the manufacturing process by naturally defining the groove depth boundary, reducing the need for complex process control mechanisms.
2Reliability
If an inorganic insulating layer with grooves is used to expose metal layer, then electrical connection integrity is improved, but reliability against impurity permeation deteriorates
Solution Approach 1:
The patent employs a composite insulating structure combining inorganic insulating layers with organic insulating layers. The inorganic layer provides electrical isolation and structural support with grooves for metal exposure, while the organic layer fills these grooves and seals the structure, creating a composite barrier that maintains electrical integrity while preventing impurity permeation through the combined material properties.
3Object-affected harmful factors
If organic insulating layer fills the grooves to prevent impurity ingress, then protection against harmful factors is improved, but manufacturing complexity increases due to additional coating and curing processes
Solution Approach 1:
The organic insulating layer is formed by depositing material that simultaneously fills the grooves and covers the inorganic insulating layer surface. This merging of functions—groove filling and surface protection—into a single continuous layer reduces the number of separate manufacturing steps required, simplifying the overall process while maintaining effective impurity barrier properties.
Data Source
AI summary
A display device may include a substrate including a first pixel area on which a first pixel is positioned and a second pixel area on which a second pixel is positioned, a metal layer disposed on the substrate between the first pixel area and the second pixel area, an inorganic insulating layer disposed on the metal layer and having a groove exposing at least a portion of the metal layer, and an organic insulating layer filling the groove of the inorganic insulating layer.