Conductive Structure for Display Electrode Reflectance Reduction
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Solution Overview
Problem
Liquid crystal display devices, particularly in IPS mode, face challenges in achieving high-quality images due to high light reflectance from pixel and common electrodes, which affects visibility and image quality at various viewing angles.
Innovation Solution
A conductive structure body comprising a substrate with a single metal first layer, a translucent second metal layer formed from multiple metals, and a light reflection reducing layer made of metallic oxynitride, which reduces average light reflectance by 7% to 50% in the visible spectrum, minimizing light reflection and enhancing visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is used in the electrode to ensure electric conductivity, then electric conductivity is improved, but light reflectance increases causing poor image quality and visibility
Solution Approach 1:
The patent applies composite materials by combining multiple metal layers (first metal layer with high conductivity, second metal layer with lower reflectance) and a light reflection reducing layer (oxynitride material) to create an electrode structure that simultaneously achieves both high electric conductivity and low light reflectance. This composite structure resolves the contradiction by allowing each layer to contribute its specific property to the overall performance.
Solution Approach 2:
The light reflection reducing layer acts as an intermediary between the metal layers and the external environment. This oxynitride layer mediates the interaction between light and the metal electrode, reducing harmful light reflection while allowing the metal layers to maintain their electric conductivity function. The intermediary layer effectively decouples the two conflicting requirements.
2Ease of manufacture
If the electrode structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but image quality deteriorates due to high light reflectance
Solution Approach 1:
The electrode is segmented into multiple functional layers: a first metal layer for primary conductivity, a second metal layer for reflectance control, and a light reflection reducing layer for optical optimization. This segmentation allows each layer to be optimized for its specific function while maintaining overall manufacturability through standard thin-film deposition techniques.
Solution Approach 2:
The patent changes the optical parameters of the electrode by introducing materials with specific optical properties (oxynitride with controlled refractive index and thickness) and adjusting the thickness and composition of metal layers. These parameter changes reduce light reflectance across the visible spectrum while maintaining electrical performance and manufacturability.
3Object-affected harmful factors
If a translucent material is used to reduce light reflectance, then light reflectance is reduced improving visibility, but electric conductivity may deteriorate
Solution Approach 1:
The electrode uses a composite structure where translucent oxynitride materials are combined with metal layers. The metal layers provide the necessary electric conductivity while the oxynitride layers provide the light reflection reduction. The composite design ensures that neither material compromises the other's primary function.
Solution Approach 2:
The patent merges the electrical function (performed by metal layers) and the optical function (performed by oxynitride layers) into a single integrated electrode structure. This merging allows the electrode to simultaneously fulfill both electrical conductivity and optical performance requirements without sacrificing either property.
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 conductive structure body achieves low light reflectance and fine line widths, improving image quality and visibility by controlling light reflection, while maintaining electric conductivity and preventing blinding effects.
Implementation Method 1
a light reflection reducing layer formed on the second metal layer and formed of a translucent material, in which the light reflection reducing layer includes an oxynitride of the metal forming the second metal layer, and average light reflectance in the surface of the light reflection reducing layer in light having a wavelength of 380 nm to 780 nm is decreased by 7% to 50%
Data Source
AI summary
The present specification relates to a conductive structure body, and an electrode and a display device including the same.