Electromagnetic Shielding Substrate With Oxide Sublayers for Low Reflectivity
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Solution Overview
Problem
Existing display panels face challenges in achieving both low reflectivity and high reliability for electromagnetic shielding, as thicker transparent conductive films increase reflectivity and thinner films complicate process control, while conductive polymer films have low hardness and short service life.
Innovation Solution
A display panel design incorporating an auxiliary layer with a stacked structure of metal oxides on a substrate, where the oxygen content of the sublayers is varied to achieve specific conductivity for electromagnetic protection, combined with an optical auxiliary layer to reduce reflectivity, using inorganic metal oxides for increased hardness and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thicker transparent conductive film is used for electromagnetic shielding, then the electromagnetic protection effect is improved, but the reflectivity of external ambient light increases
Solution Approach 1:
The auxiliary layer is divided into multiple sublayers with different oxygen contents, where the first sublayer has higher oxygen content for lower reflectivity and the second sublayer has lower oxygen content for higher conductivity. This segmentation allows each sublayer to optimize for its specific function while working together to achieve both low reflectivity and effective electromagnetic shielding.
Solution Approach 2:
Different regions of the auxiliary layer are assigned different oxygen contents to achieve different local properties. The first sublayer (higher oxygen content) provides optical quality with lower reflectivity, while the second sublayer (lower oxygen content) provides electrical quality with higher conductivity for electromagnetic shielding.
2Illumination intensity
If a thinner transparent conductive film is used for electromagnetic shielding, then the reflectivity is reduced, but the process control becomes difficult and resistance variation increases
Solution Approach 1:
Instead of using a single thin film that is difficult to control, the solution segments the layer into multiple sublayers. This allows each sublayer to be formed with more relaxed process control while achieving the cumulative effect of the desired thickness, thereby reducing resistance variation and improving manufacturing precision.
Solution Approach 2:
The auxiliary layer uses a composite structure of multiple sublayers with different compositions (different oxygen contents). This composite approach provides greater process tolerance because each sublayer can be independently optimized and controlled, reducing the impact of variations in any single layer on the overall performance.
3Stability of the object's composition
If a conductive polymer film is used for electromagnetic shielding, then the refractive index matches the substrate well, but the hardness is low and service life is short
Solution Approach 1:
The patent replaces conductive polymer films with a composite inorganic metal oxide structure. The auxiliary layer comprises multiple sublayers of metal oxides (such as zinc oxide, tin oxide, or indium oxide) with different oxygen contents, creating a composite material that simultaneously achieves the desired refractive index matching, high hardness, and long service life.
Solution Approach 2:
The refractive index and optical properties are controlled by changing the oxygen content parameter in the metal oxide sublayers. By adjusting the oxygen stoichiometry in the metal oxide compounds, the refractive index can be tuned to match the substrate while maintaining the inherent hardness and stability of inorganic materials.
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 integrates electromagnetic protection with anti-reflection performance, allowing for larger process tolerance and improved display quality while maintaining low reflectivity and high reliability.
Implementation Method 1
The auxiliary layer includes a first sublayer and a second sublayer. The second sublayer is connected between the first sublayer and the first substrate. A chemical ingredient of the first sublayer is MxOy, and a chemical ingredient of the second sublayer is MxOz... to achieve specific conductivity for electromagnetic protection
Implementation Method 2
the above-mentioned display panel further includes an optical auxiliary layer disposed on a side of the auxiliary layer away from the first substrate. A refractive index of the auxiliary layer is greater than a refractive index of the optical auxiliary layer
Data Source
AI summary
The disclosure provides an electromagnetic shielding substrate including a first substrate and an auxiliary layer. The auxiliary layer is disposed on the first substrate and directly contacts the first substrate. The auxiliary layer includes a first sublayer and a second sublayer. The second sublayer is connected between the first sublayer and the first substrate. The chemical ingredient of the first sublayer is MxOy, and the chemical ingredient of the second sublayer is MxOz, and M is selected from one of Nb, Mo, Ta, Te, Ti, Tl, Y, Yb, Zr, and Zn, where x and y are positive integers, and y−1<z<y. A display panel using the above electromagnetic shielding substrate is also provided.