Transparent Conductive Layer Structure for Low Impedance Displays
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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, while also aiming to increase the aperture ratio.
Innovation Solution
The electronic device incorporates a substrate with a first signal line, an insulating layer, a first transparent conductive layer, and a metal layer, where the metal layer is electrically connected to the transparent conductive layer and disposed between the insulating layers, reducing impedance and shielding metal reflections to enhance signal uniformity and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix layer is used to shield metal reflection, then visual visibility is improved, but the aperture ratio is reduced
Solution Approach 1:
The patent extracts and removes the black matrix layer from the display structure, replacing it with a metal layer that performs the shielding function without the visual drawbacks. This eliminates the need for the black matrix layer while maintaining or improving visual visibility and increasing the aperture ratio.
Solution Approach 2:
The patent changes the material parameter from black matrix material to metal material, which fundamentally alters the shielding mechanism. The metal layer provides reflection-based shielding rather than absorption, enabling thinner layers and higher aperture ratios while maintaining visual visibility.
2Area of stationary object
If the transparent conductive layer is made thinner to increase aperture ratio, then the aperture ratio is improved, but the impedance increases
Solution Approach 1:
The patent creates a composite structure by stacking multiple transparent conductive layers with different material compositions and thicknesses. This composite approach allows the overall structure to maintain low impedance while achieving high aperture ratio, as each layer contributes differently to the electrical and optical properties.
Solution Approach 2:
The patent applies different material properties to different regions and layers of the transparent conductive structure. By optimizing the thickness and material composition of each individual layer, the structure achieves uniform impedance control across the entire display while maintaining high aperture ratio.
3Reliability
If a metal layer is added to reduce impedance, then the impedance is improved, but the device complexity increases
Solution Approach 1:
The metal layer serves multiple functions simultaneously: it acts as an electrical conductor to control impedance, provides mechanical support for the transparent conductive layers, and can contribute to the overall structural integrity of the display. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
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 the impedance of the transparent conductive layer, improves signal uniformity, and increases the aperture ratio by minimizing visual visibility issues and eliminating the need for a black matrix layer, thereby enhancing display quality.
Implementation Method 1
mitigating a problem of visual visibility caused by metal reflection
Data Source
AI summary
An electronic device includes a substrate, a first signal line, an insulating layer, a first transparent conductive layer and a metal layer. The first signal line is disposed on the substrate. The insulating layer is disposed on the first signal line and has an opening. The first transparent conductive layer is disposed on the insulating layer. The metal layer is disposed between the insulating layer and the first transparent conductive layer. The metal layer is electrically connected to the first transparent conductive layer. At least a portion of the metal layer and at least a portion of the first transparent conductive layer are disposed in the opening.