Translucent Electrostatic Shielding Layer for LCD Panels
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Solution Overview
Problem
Lateral electric field liquid crystal display panels are susceptible to image disturbance due to static electricity, as they lack electrostatic shielding, unlike vertical electric field panels, and existing shielding solutions using ITO films are prone to chemical reactions that degrade the display quality.
Innovation Solution
A translucent electrostatic shielding layer made from materials like SnO2 or a mixture of SnO2 and other metals is applied to the substrates, which does not react with polarizer materials and maintains its integrity, reducing reflectance and making surface imperfections less visible, while providing effective shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a translucent electrostatic shielding layer is provided on the substrate to prevent image disturbance from static electricity, then the shielding effect is improved, but the reflectance increases and surface imperfections become more visible
Solution Approach 1:
The patent changes the material parameter of the electrostatic shielding layer from conventional ITO to SnO2 or its mixtures. This material substitution fundamentally alters the chemical properties to eliminate reactions with polarizer materials while maintaining electrostatic shielding functionality, and allows for optimized thickness parameters to control reflectance
Solution Approach 2:
The patent employs composite material formulations, specifically SnO2 mixed with other metals (such as In, Ga, Zn, or Al), to create an electrostatic shielding layer that combines the benefits of high electrostatic shielding performance with reduced reflectance and improved chemical stability against polarizer materials
2Object-affected harmful factors
If the electrostatic shielding layer is made thinner to reduce reflectance, then the display quality is improved, but the electrostatic shielding effectiveness may be reduced
Solution Approach 1:
The patent optimizes the thickness parameter of the electrostatic shielding layer within a specific range (50-300 nm) to achieve the optimal balance between reflectance reduction and electrostatic shielding effectiveness. This parameter optimization is made possible by the superior material properties of SnO2-based compositions
Solution Approach 2:
By using composite materials consisting of SnO2 mixed with other metals, the patent achieves enhanced electrostatic shielding performance per unit thickness, allowing for thinner layers that maintain shielding effectiveness while reducing reflectance and improving overall display quality
3Illumination intensity
If ITO film is used as the electrostatic shielding layer, then the transparency is improved, but the film disappears due to chemical reaction with polarizer material
Solution Approach 1:
The patent fundamentally changes the chemical composition parameter of the electrostatic shielding layer from ITO (In2O3:Sn) to SnO2-based materials. This compositional change eliminates the chemical reactivity issue with polarizer materials while maintaining the necessary transparency and electrostatic shielding properties
Solution Approach 2:
The patent replaces the chemically unstable ITO film with a more stable SnO2-based material that does not disappear through chemical reactions, ensuring long-term durability and stability of the electrostatic shielding function without requiring frequent replacement or repair
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 prevents image disturbance from static electricity and maintains display quality by ensuring the shielding layer does not disappear due to chemical reactions, allowing for thinner panels with improved brightness and reduced reflectance.
Implementation Method 1
a translucent electrostatic shielding layer provided on an exterior surface of at least one of the pair of substrates
Implementation Method 2
the translucent electrostatic shielding layer has properties not to disappear by a chemical reaction with a material forming the polarizer
Data Source
AI summary
A lateral electric field liquid crystal display panel is provided which includes a pair of substrates, a liquid crystal enclosed between the pair of substrates, liquid crystal-drive electrodes provided on one of the pair of substrates, a translucent electrostatic shielding layer provided on an exterior surface of at least one of the pair of substrates, and a polarizer disposed on the translucent electrostatic shielding layer, and in this liquid crystal display panel, the translucent electrostatic shielding layer has properties not to disappear by a chemical reaction with a material forming the polarizer.