Reflective Wiring Substrate for Oxidation-Resistant Metal Traces
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Solution Overview
Problem
Current LED backlighting systems for display products face challenges in protecting metal traces from oxidation and corrosion, which affects the performance and longevity of the wiring substrate, and there is a need for improved light reflection and efficiency in light-emitting devices.
Innovation Solution
A wiring substrate is designed with a substrate, metal traces, an insulative layer, and an oxidation protective layer, where the insulative layer is made of white ink or a combination of photoresist and reflective layers, and the oxidation protective layer includes nickel and gold, providing protection against oxidation and corrosion, and enhancing light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal traces are exposed on the substrate surface for electrical connection, then electrical connectivity is achieved, but the metal traces are vulnerable to oxidation and corrosion
Solution Approach 1:
The patent employs a composite protective structure consisting of an insulative layer made from white ink material and an oxidation protective layer comprising nickel and gold. This composite material approach provides both electrical insulation and oxidation protection simultaneously, resolving the contradiction between reliability improvement and device complexity by integrating multiple protective functions into a unified layered structure.
Solution Approach 2:
The insulative layer acts as an intermediary between the substrate and the oxidation protective layer, while the oxidation protective layer serves as an intermediary between the metal traces and the external environment. This intermediary approach allows the metal traces to maintain electrical connectivity while being protected from oxidation and corrosion through multiple intermediate protective barriers.
2Reliability
If the insulative layer is made thicker to improve insulation and protection, then oxidation protection is enhanced, but light reflection efficiency is reduced
Solution Approach 1:
The patent uses a composite layered structure where the insulative layer (white ink material) provides both insulation and initial light reflection, while the oxidation protective layer (nickel and gold) provides additional protection and enhanced light reflection. This composite approach allows achieving both thick protection and high light reflection efficiency by distributing functions across multiple layers with different optical and protective properties.
Solution Approach 2:
The oxidation protective layer is selectively applied to specific regions where metal traces are located, providing localized enhanced protection and light reflection exactly where needed. This local quality approach ensures that the protective thickness is optimized for protection effectiveness while maintaining overall light reflection efficiency by not unnecessarily thickening layers in non-critical areas.
3Reliability
If white ink is used as the insulative layer material, then light reflection is improved and oxidation protection is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent specifies that the insulative layer is made from white ink material, which inherently provides both good light reflection properties and oxidation resistance. This material selection approach improves both protection performance and light reflection without requiring additional separate layers for each function, thereby managing manufacturing complexity while achieving enhanced reliability.
4Reliability
If the oxidation protective layer includes multiple metals (nickel and gold), then protection effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a composite protective layer comprising nickel and gold, where nickel provides baseline oxidation resistance and gold provides superior corrosion resistance and enhanced light reflection. This composite material approach optimizes the balance between protection effectiveness and material cost by combining materials with complementary properties, achieving high reliability without excessively increasing material quantities and costs.
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
The solution effectively protects metal traces from oxidation and corrosion, improves light reflection, and enhances the performance and efficiency of light-emitting devices by preventing erosion and oxidation, thus improving product reliability and productivity.
Implementation Method 1
a distance between a surface, away from the substrate, of the insulative layer and the substrate is greater than a distance between a surface, away from the substrate, of the metal trace and the substrate, the surface, away from the substrate, of the insulative layer is capable of reflecting light
Implementation Method 2
the oxidation protective layer is in direct contact with the metal trace, a material of the oxidation protective layer includes nickel and gold
Data Source
AI summary
Provided in the embodiments of the present disclosure are a wiring substrate and a manufacturing method therefor, a light-emitting panel, and a display apparatus. The wiring substrate comprises: a substrate, a plurality of metal wires and an insulation layer, wherein the metal wires and the insulation layer are located on a same side of the substrate; the insulation layer is located in an area outside the metal wires and a part of the surfaces of the metal wires; the distance between the upper surface of the insulation layer and the substrate is greater than the distance between the upper surfaces of the metal wires and the substrate; the upper surface of the insulation layer can reflect light rays; the insulation layer is provided with first holes, and the first holes expose a part of the surfaces of the metal wires. By means of arranging the insulation layer, a function of protecting the metal wires can be achieved, so as to prevent the metal wires from being oxidized and corroded during a manufacturing process, and improve product performance. In addition, the surface of the insulation layer can reflect light rays, thus improving a light effect.