PMMA Polymer Layer for LCD Alignment Stability
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Solution Overview
Problem
The polymer-stabilized alignment (PSA) technique for LCD panels requires a long exposure time for UV light to polymerize monomers, which affects productivity and can result in incomplete curing and reduced display contrast if the time is inadequate, or prolonged exposure time that compromises response time and performance.
Innovation Solution
Incorporating polymethyl methacrylate (PMMA) into the polymer layer, with a concentration greater than 1 ppm and less than 15000 ppm, along with polymerizable monomers, to reduce the exposure time needed for polymerization and improve adhesion between the polymer and alignment layers, allowing for a shorter response time and enhanced display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exposure time is prolonged to ensure complete polymerization, then the alignment stability is improved, but the productivity is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer layer by incorporating PMMA as a key component. This compositional parameter change enables the polymerization process to achieve complete curing in a shorter exposure time, thus improving productivity while maintaining alignment stability.
Solution Approach 2:
The patent uses a composite material system consisting of PMMA combined with other polymer components. This composite formulation enhances the polymerization efficiency and UV light absorption characteristics, allowing for reduced exposure time while ensuring complete curing and stable alignment.
2Productivity
If the exposure time is insufficient to complete polymerization, then the productivity is improved, but the alignment stability is reduced
Solution Approach 1:
By modifying the chemical composition to include PMMA, the patent changes the polymerization kinetics parameters. This enables the system to achieve complete polymerization at shorter exposure times, thus maintaining alignment stability while improving productivity.
3Reliability
If the exposure time is prolonged, then the polymerization is complete, but the response time of liquid crystal molecules increases
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating PMMA, which has superior UV absorption and polymerization characteristics. This enables complete polymerization to be achieved in shorter exposure time, thus maintaining polymerization completeness while reducing the response time of liquid crystal molecules.
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 use of PMMA in the polymer layer shortens the exposure time required for the PSA process, resulting in a faster response time for liquid crystal molecules and improved display quality with reduced dark stripes and light leakage, while maintaining high productivity.
Implementation Method 1
the monomers are irradiated by the UV light to form the polymer layer
Data Source
AI summary
A liquid crystal panel including a first substrate, a second substrate, a liquid crystal layer disposed between the first substrate and the second substrate, a counter electrode, a pixel array structure, at least one alignment layer and at least one polymer layer is provided. The counter electrode is disposed between the liquid crystal layer and the first substrate. The pixel array structure is disposed between the liquid crystal layer and the second substrate. The alignment layer is disposed between the counter electrode and the liquid crystal layer and between the pixel array structure and the liquid crystal layer. The polymer layer is disposed between the alignment layer and the liquid crystal layer, and a material of the polymer layer includes polymer monomers and polymethyl methacrylate (PMMA). A content of PMMA in the polymer layer is greater than 1 ppm and smaller than 15000 ppm.