Reactive Mesogen Planar Structure for LCD Curing Speed
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Solution Overview
Problem
The existing manufacturing processes for liquid crystal display (LCD) panels face challenges in reducing cure time and improving productivity, as incomplete curing of reactive mesogens can lead to afterimages and increased power consumption, while increasing illumination intensity or exposure time can damage liquid crystal molecules and alignment layers.
Innovation Solution
A method involving the use of a liquid crystal composition with a reactive mesogen (RM) represented by Chemical Formula 1, where the RM is cured between alignment layers on opposing substrates, with a planar structure to stabilize free radicals, allowing for faster and more selective curing, and including an initiator to promote photopolymerization, thereby reducing manufacturing time and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If illumination intensity of light source is increased to cure RM completely, then curing completeness is improved, but power consumption and manufacturing costs increase
Solution Approach 1:
The patent changes the chemical parameters of the RM by introducing a planar core structure with extended pi-conjugation system. This structural modification increases light reaction speed and curing sensitivity, allowing complete curing at lower illumination intensities, thus reducing power consumption while maintaining curing completeness
Solution Approach 2:
The patent uses composite material design by combining the planar core structure with specific terminal groups (acrylate or methacrylate) and mesogenic groups. This composite structure optimizes both the light reaction efficiency and the liquid crystal properties, enabling effective curing with reduced energy input
2Speed
If illumination intensity is increased to cure RM faster, then curing speed is improved, but liquid crystal molecules and alignment layer are damaged
Solution Approach 1:
The patent modifies the chemical structure parameters of the RM to have high photoreactivity with appropriate absorption coefficient. This allows the curing reaction to proceed rapidly at lower light intensities, achieving fast curing speed without the need for high illumination that would damage liquid crystal molecules and alignment layer
3Reliability
If exposure time is increased to ensure complete curing, then curing completeness is improved, but manufacturing time increases and productivity deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by selecting RMs with high light reaction speed and appropriate molecular weight. These parameters enable complete curing in short exposure times, improving both curing completeness and manufacturing efficiency simultaneously
Solution Approach 2:
The patent performs preliminary optimization of the RM structure before the curing process, ensuring high photoreactivity and appropriate viscosity. This preliminary preparation allows the curing reaction to complete quickly under mild conditions, reducing exposure time and improving productivity without compromising curing completeness
4Reliability
If energy is increased to cure RM completely, then curing completeness is improved, but manufacturing cost increases
Solution Approach 1:
The patent optimizes the chemical parameters of the RM to achieve high curing efficiency. The planar core structure with extended pi-conjugation provides high light absorption efficiency and fast reaction kinetics, allowing complete curing with minimal energy input, thus reducing manufacturing cost while ensuring curing completeness
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
This approach decreases manufacturing time and enhances the quality of LCD panels by stabilizing free radicals in the RM, ensuring complete curing without damaging the liquid crystal molecules or alignment layers, thus improving productivity and display quality.
Implementation Method 1
Polarized ultraviolet (UV) light is used to irradiate a photocrosslinkable copolymer including a mesogenic group having liquid crystal properties, the mesogenic group being referred as a reactive mesogen (RM), to induce anisotropy in the photocrosslinkable copolymer
Data Source
AI summary
A black matrix is disposed on a surface of a first base substrate having a switching element, a color filter is disposed on the switching element in a pixel area, a pixel electrode is disposed on the first base substrate having the color filter, and a first alignment layer is disposed on the pixel electrode to form a first substrate. A common electrode layer is disposed on a second base substrate, and a second alignment layer is disposed on the common electrode layer to form a second substrate. A liquid crystal composition including a reactive mesogen (RM) is interposed between opposing surfaces of the first and second substrates. The RM is cured to form a mesogen cured product on the first and second alignment layers. Accordingly, an RM having a planar structure increases curing speed, reduces, manufacturing time, and improves quality of the LCD panel.