Photosensitive Monomer Structure for LCD Alignment Stability
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Solution Overview
Problem
Current liquid crystal display (LCD) panels using polymer-stabilizing alignment (PSA) technology suffer from slow response rates and poor display quality due to unsuitable polymerizable monomers, which limit their performance compared to conventional CRT screens.
Innovation Solution
A method for fabricating an LCD panel involving the use of photosensitive monomers represented by the chemical formula P1-A1-(Z1—RS—Z2-A2)n-P2, where n≥1, with specific aryl, linking, and polymerizable groups, and a process of applying a voltage and light to polymerize these monomers between substrates, forming stabilized alignment polymers that enhance liquid crystal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymerizable monomers are used in PSA technology, then the liquid crystal layer can be formed, but the response rate becomes slow and display quality deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the photosensitive monomer by introducing specific structural features: aryl groups (A1, A2) for molecular rigidity and alignment control, linking groups (Z1, Z2) for flexible connection, and alkyl chains (RS) for steric effects. These parameter changes in monomer structure enable both fast response rate and excellent display quality by optimizing the balance between molecular mobility and alignment stability.
Solution Approach 2:
The patent creates a composite liquid crystal system by mixing the liquid crystal compound with specifically designed photosensitive monomers. This composite material approach allows the liquid crystal molecules to benefit from both the fast response characteristics of the liquid crystal phase and the alignment stability provided by the polymer network formed from the photosensitive monomer, resolving the contradiction between response speed and display quality.
2Reliability
If conventional monomer concentrations are used in PSA technology, then sufficient alignment is achieved, but manufacturing cost increases
Solution Approach 1:
The patent changes the concentration parameter of photosensitive monomer from conventional levels to an optimized range of 0.15% to 0.3% by weight. This parameter change, combined with the improved monomer structure containing aryl groups and specific linking groups, maintains sufficient alignment stability at lower concentrations, thereby reducing material dosage and manufacturing cost while preserving alignment quality.
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 method results in an LCD panel with a fast response rate and excellent display quality, allowing for a wider range of photosensitive monomer concentrations (0.15% to 0.3% by weight) without compromising performance, reducing manufacturing costs by using a quarter to a half dosage of conventional monomers.
Implementation Method 1
a plurality of polymerizable monomers are mixed with a liquid crystal layer first, and an energy source such as a UV-light or heat is applied to the liquid crystal layer after the polymerizable monomers were arranged. The polymerizable monomers are polymerized as alignment polymers for guiding the liquid crystal compounds of the LCD panel in alignment.
Implementation Method 2
forming a stabilized alignment polymer polymerized from the plurality of photosensitive monomers by applying a voltage between the upper substrate and the lower substrate and radiating a light
Data Source
AI summary
A liquid crystal display (LCD) panel including a lower substrate, an upper substrate and a liquid crystal layer interposed between the upper substrate and the lower substrate is provided. The liquid crystal layer includes at least one liquid crystal molecule and a stabilized alignment polymer, which is polymerized by a plurality of photosensitive monomers and formed on at least one of the surface of the upper substrate or the lower substrate. The photosensitive monomer is represented by the following chemical formula:P1-A1-(Z1—RS—Z2-A2)n-P2 Wherein, n≧1;“P1” and “P2” are independently a polymerizable group;“A1” and “A2” are independently a aryl group;“Z1” and “Z2” are independently a linking group; and“RS” is straight-chain or branched-chain alkyl having 1 to 6 carbons or a derivative thereof.