Transparent Conductive Layer Stack for Low-Impedance Display Panels
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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 data line, insulating layers, a metal layer, and a transparent conductive layer, where the metal layer is disposed on the insulating layer and electrically connected to the transparent conductive layer, reducing impedance and mitigating visual visibility by shielding metal reflections, and potentially replacing the black matrix layer to enhance the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent conductive layer is used in display panels, then electrical conductivity is achieved, but impedance remains high which affects signal transmission quality
Solution Approach 1:
The patent uses a composite structure consisting of a transparent conductive layer (first conductive layer) combined with a metal layer (second conductive layer) to form a composite conductive structure. This composite material approach reduces the overall impedance while maintaining transparency and electrical conductivity, thereby improving signal transmission quality without sacrificing the beneficial properties of individual materials.
2Reliability
If metal layers are used to reduce impedance, then electrical conductivity improves, but metal reflection causes visual visibility issues
Solution Approach 1:
The patent applies local quality by making the metal layer transparent in specific regions where it overlaps with pixel areas, while maintaining its reflective properties in non-display areas. This is achieved through selective transparency design where the metal layer's optical properties are modified locally to prevent harmful reflections in visible areas while preserving electrical conductivity functionality.
Solution Approach 2:
The patent utilizes color/optical property changes by making the metal layer transparent in display regions and opaque or reflective in non-display regions. This optical property variation allows the metal layer to serve dual functions: maintaining electrical conductivity where needed while preventing harmful reflections in visual areas through selective transparency or opacity adjustments.
3Object-generated harmful factors
If a black matrix layer is used to shield metal reflections, then visual visibility improves, but aperture ratio decreases
Solution Approach 1:
The patent extracts and removes the black matrix layer from the display structure, replacing its shielding function with a transparent metal layer that inherently blocks reflections without requiring additional opaque materials. This extraction eliminates the need for black matrix layers that would reduce aperture ratio, while the metal layer provides equivalent or superior reflection shielding through its inherent optical properties.
4Illumination intensity
If display panels are made larger with high resolution, then display quality improves, but impedance and signal transmission issues become more pronounced
Solution Approach 1:
The patent employs composite conductive materials combining transparent conductive oxides with metal layers to create a low-impedance pathway for signal transmission. This composite structure is particularly beneficial in large-sized high-resolution displays where long signal transmission paths would otherwise encounter excessive impedance, thereby maintaining signal integrity and display quality across larger areas.
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 reduces the impedance of the transparent conductive layer, improves signal uniformity, and increases the aperture ratio by effectively shielding metal reflections and eliminating the need for a black matrix layer, thereby enhancing display quality.
Implementation Method 1
the metal layer is disposed on the insulating layer and electrically connected to the transparent conductive layer, reducing impedance and mitigating visual visibility by shielding metal reflections
Implementation Method 2
The transparent conductive layer is disposed on the metal layer and electrically connected to the metal layer
Data Source
AI summary
An electronic device includes a substrate, a data line, an insulating layer, a metal layer and a transparent conductive layer. The data line is disposed on the substrate. The insulating layer is disposed on the data line. The metal layer is disposed on the insulating layer. The transparent conductive layer is disposed on the metal layer and electrically connected to the metal layer.