Low-Reflection Metal Layer Layout for Display Aperture Ratio
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Solution Overview
Problem
Existing electronic devices face challenges in reducing the impedance of transparent conductive layers and mitigating visual visibility issues caused by metal reflection, which affect display quality and aperture ratio.
Innovation Solution
Incorporating a low-reflection metal material layer with a thickness less than 5000 Å between the first signal line and an insulating layer, and using a metal layer to shield metal reflections while replacing the traditional black matrix layer, thereby reducing impedance and enhancing aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional black matrix layer is used to shield metal reflections, then visual visibility issues are mitigated, but the aperture ratio decreases
Solution Approach 1:
The patent changes the material parameter from traditional black matrix materials to low-reflection metal materials (such as Mo, Ti, Cr, or their alloys). This material substitution allows the shielding layer to maintain thinness while achieving effective reflection suppression, thereby preserving aperture ratio while mitigating metal reflection visibility
Solution Approach 2:
The patent employs composite material structures where low-reflection metal materials are combined with transparent conductive layers (such as ITO, IZO, or IGZO) in specific thickness ratios. This composite approach enables both optical performance (reducing reflection visibility) and electrical performance (maintaining conductivity) while minimizing the area occupied by shielding layers
2Object-affected harmful factors
If the metal layer thickness is increased to improve shielding effect, then visual visibility issues are mitigated, but the impedance of the transparent conductive layer increases
Solution Approach 1:
The patent optimizes the thickness parameter of the metal layer to be within 5000 Å (specifically 50-5000 Å), which is sufficient to shield metal reflections while maintaining low impedance. This precise parameter control resolves the contradiction between shielding effectiveness and electrical performance
Solution Approach 2:
The patent creates a composite structure where a thin metal layer (50-5000 Å) is combined with a transparent conductive layer of optimized thickness. This composite configuration achieves effective reflection shielding while the transparent conductive layer compensates for any impedance increase, maintaining overall electrical performance
3Object-affected harmful factors
If the thickness of the low-reflection metal material layer is increased to improve shielding, then visual visibility issues are mitigated, but the aperture ratio decreases
Solution Approach 1:
The patent identifies and applies the critical threshold parameter of 5000 Å for the metal layer thickness. By controlling the thickness within this range (specifically 50-5000 Å), the patent achieves sufficient shielding effect while keeping the layer thin enough to preserve aperture ratio above 50%
Solution Approach 2:
The patent replaces the traditional black matrix layer with a thin low-reflection metal material layer that copies the shielding function but with superior optical and electrical properties. This substitution enables effective reflection mitigation with minimal impact on aperture ratio
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 reduces impedance, improves signal uniformity, mitigates visual visibility issues, and increases aperture ratio by using a low-reflection metal layer to shield metal reflections and replace the black matrix layer.
Implementation Method 1
mitigating a problem of visual visibility caused by metal reflection
Implementation Method 2
reduce an impedance of a transparent conductive layer
Data Source
AI summary
An electronic device includes a substrate, a first signal line, an insulating layer, and a metal layer. The first signal line is disposed on the substrate. The insulating layer is disposed on the substrate. The metal layer is disposed on the substrate. At least a portion of the metal layer overlapping the first signal line and the insulating layer, wherein the insulating layer is disposed between the first signal line and the metal layer, the metal layer comprises at least one of a low-reflection metal material layer, and the metal layer has a thickness less than 5000 Å.