Segmented Coating Layer for Display Wire Corrosion Protection
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Solution Overview
Problem
In organic light emitting display apparatuses, the continuous organic insulating coating layer is prone to water absorption and has low adhesion to inorganic insulating films, leading to corrosion of metallic wires due to moisture and impurity ion penetration, which results in disconnection or short-circuit issues.
Innovation Solution
A display apparatus design with a coating layer having separated regions between metallic wires, where the end edge of the coating layer lies beyond the adhesion region but does not reach the terminal region, preventing water and impurity ion penetration and enhancing adhesion reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous organic insulating coating layer is used to cover metallic wires in the adhesion region, then the wires are protected from direct exposure, but the coating layer absorbs water and has low adhesion to inorganic insulating films, leading to corrosion and disconnection
Solution Approach 1:
The continuous coating layer is divided into multiple separate coating portions, each covering individual metallic wires or groups of wires. The gaps between coating portions allow the inorganic insulating film to extend continuously, creating a dual-protection system where both the organic coating and inorganic film work together to prevent corrosion while maintaining adhesion.
2Reliability
If the coating layer extends to the terminal region, then wire protection is maximized, but masking and adhesive application become difficult due to surface irregularities
Solution Approach 1:
The coating layer is designed with different spatial distributions: in the adhesion region, separate coating portions provide corrosion protection while maintaining manufacturing ease; in the terminal region, the coating layer is removed to create a flat surface for masking and adhesive application. This local differentiation optimizes both protection and manufacturability in different functional zones.
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
This design effectively prevents corrosion of metallic wires, improving the reliability and manufacturing yield of the display apparatus by creating a barrier against moisture and impurity ions, while maintaining a flat surface for secure masking and adhesive application.
Implementation Method 1
an inorganic insulating film 240 including silicon nitride (SiNX) or silicon dioxide (SiO2) or the like is provided in order to shield the display part 214 from the atmospheric air
Implementation Method 2
the coating layer 213 includes an organic insulating material, it is liable to absorb water (moisture)
Data Source
AI summary
A display apparatus has a driving panel including a circuit part, a coating layer, and a display part, provided sequentially over a driving substrate. The driving panel includes: an adhesion region which includes the circuit part, the coating layer and the display part and to which a seal panel is adhered through an adhesive layer therebetween; and a terminal region protruding from the seal panel and the adhesive layer. A plurality of metallic wires electrically connected to the circuit part in the adhesion region are extended into the terminal region, and the coating layer is provided in the adhesion region with at least one separated region between the plurality of metallic wires. The separated region of the coating layer is so formed that an end edge thereof lies beyond the adhesion region to reach the terminal region but not to reach an end edge of the terminal region.