Transparent Electrode with Light-Shielding Conductor
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Solution Overview
Problem
Oxide semiconductors in liquid crystal display panels are prone to deterioration from light exposure, and existing solutions do not adequately address the need for low resistance electrodes to ensure uniform electric potential across the panel.
Innovation Solution
A light-shielding conductor with higher conductivity than the transparent conductive material is used to cover the oxide semiconductor, preventing light exposure and lowering the resistance of the electrode, while also extending along gate electrode lines to inhibit potential non-uniformity and maintaining the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent conductive material is used as an electrode, then the electrode can be transparent and maintain good optical properties, but the resistance of the electrode is high and the electric potential is non-uniform
Solution Approach 1:
The patent uses a composite structure consisting of a transparent conductive material layer (such as ITO) and a light-shielding conductor layer (such as Al or Mo). This composite electrode structure combines the transparency advantage of the transparent conductive material with the low resistance and high conductivity of the light-shielding conductor, achieving both good optical properties and uniform electric potential distribution across the common electrode.
2Illumination intensity
If the aperture ratio is increased to improve display quality, then the light transmission is improved, but the oxide semiconductor becomes more exposed to light
Solution Approach 1:
The light-shielding conductor layer acts as an intermediary protective layer between the oxide semiconductor and incident light. It selectively blocks harmful light wavelengths from reaching the oxide semiconductor while allowing the aperture ratio to be optimized for display quality, as the light-shielding conductor is positioned in the electrode structure rather than occupying pixel aperture space.
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 protects the oxide semiconductor from light, ensures uniform electric potential, and maintains the aperture ratio, thereby enhancing the performance and image quality of the liquid crystal display panel.
Implementation Method 1
a light-shielding conductor formed on the electrode and covering the semiconductor layer, the light-shielding conductor being formed of a material which has a conductivity higher than a conductivity of the transparent conductive material and has a light-shielding property
Implementation Method 2
the light-shielding conductor being formed of a material which has a conductivity higher than a conductivity of the transparent conductive material
Data Source
AI summary
In a transparent substrate (10), there are formed a semiconductor layer (14) formed of an oxide semiconductor, the semiconductor layer (14) functioning as a channel portion of a TFT (2); an electrode (16) formed of a transparent conductive material and located over the semiconductor layer (14), and a light-shielding conductor (17) formed on the electrode (16), the light-shielding conductor being formed of a material which has a conductivity higher than that of the transparent conductive material and which has light-shielding property, the light-shielding conductor covering the semiconductor layer (14). This structure can inhibit exposure of the oxide semiconductor which forms the channel portion toward a light, and can lower the resistance of the electrode formed of the transparent conductive material.