Metal Compound Layer Reducing Light Reflectance in Display Wiring
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Solution Overview
Problem
Display devices face challenges in reducing external light reflection from wirings, which degrades image quality due to the high reflectance of conventional metallic materials used in the wiring layers.
Innovation Solution
A display device structure incorporating a conductive metal layer and a metal compound layer, where the metal compound layer has a lower reflectance and higher resistance than the conductive material, is used. The metal compound layer is formed by oxidation or nitridation of the conductive material, and is strategically placed to cover the top and side surfaces of the conductive layers to reduce external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive metal layer is used for wiring, then electrical conductivity is improved, but light reflectance increases
Solution Approach 1:
The patent applies composite materials by combining a conductive metal layer with a metal compound layer (oxide or nitride). The conductive metal layer provides electrical conductivity while the metal compound layer reduces light reflectance. This composite structure resolves the contradiction by integrating two materials with complementary properties - one for electrical performance and one for optical performance.
Solution Approach 2:
The patent applies local quality by creating different regions with different properties within the wiring structure. The conductive metal layer is positioned where electrical conductivity is needed, while the metal compound layer is positioned where light reflectance reduction is needed (covering top and side surfaces). This spatial differentiation allows each layer to optimize its specific function without compromising the other.
2Object-generated harmful factors
If a metal compound layer is added to reduce light reflectance, then light reflectance is reduced, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by forming the metal compound layer during the same fabrication process as the conductive metal layer, specifically using oxidation or nitridation treatments on the patterned metal layers before final patterning. This preliminary formation of the compound layer integrates the anti-reflective function into the existing manufacturing workflow, reducing overall process complexity despite adding a functional layer.
Solution Approach 2:
The patent applies parameter changes by modifying the physical and chemical properties of the metal layer through oxidation or nitridation. By changing the material composition (from pure metal to metal oxide/nitride) and controlling the thickness of the compound layer, the patent achieves reduced light reflectance while maintaining a relatively simple structural configuration that can be integrated into existing display device manufacturing.
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 configuration effectively reduces external light reflectance while maintaining high electrical conductivity, thereby enhancing display quality and minimizing visual impact of light reflection.
Implementation Method 1
The metal compound layer includes an oxide or a nitride of the first conductive material
Implementation Method 2
The metal compound layer includes an oxide or a nitride of the first conductive material
Data Source
AI summary
A display device and a method of fabricating a display device are provided. A display device includes a substrate. The wiring layer includes a conductive metal layer and a metal compound layer of the conductive metal layer, The metal compound layer surrounds the conductive metal layer.