Reactive Mesogen Mixture for LCD Curing Uniformity
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Solution Overview
Problem
The manufacturing of LCD panels faces challenges with afterimages and display quality due to uncured reactive mesogens in the liquid crystal layer, which can be exacerbated by increased energy or exposure time, leading to higher power consumption and productivity issues.
Innovation Solution
A method involving a mixture of reactive mesogens with different light reaction speeds is used, where a first compound with a faster reaction speed forms a lower cured layer and a second compound with a slower reaction speed forms an upper cured layer, optimizing the curing time and preventing exposure stains without increasing illumination intensity or exposure time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the energy provided to the curing process is increased by increasing the illumination intensity of a light source, then the curing speed of the reactive mesogen is improved, but power consumption and manufacturing costs increase
Solution Approach 1:
The patent changes the chemical parameters of the reactive mesogen by selecting specific compounds with different light reaction speeds (first compound with faster reaction, second compound with slower reaction). This allows optimization of curing speed without increasing illumination intensity, thereby reducing power consumption while maintaining effective curing
2Speed
If the energy provided to the curing process is increased by increasing the illumination intensity of a light source, then the curing speed of the reactive mesogen is improved, but display quality deteriorates due to damage to liquid crystal compounds and alignment film
Solution Approach 1:
The patent changes the chemical composition parameters by using a mixture of reactive mesogens with different light reaction speeds. This allows the curing process to proceed at lower illumination intensity, preventing damage to liquid crystal compounds and alignment film while still achieving complete curing through the synergistic effect of the two compounds
3Reliability
If the exposure time for the curing process is increased, then the curing completeness of the reactive mesogen is improved, but productivity deteriorates due to increased manufacturing time
Solution Approach 1:
The patent uses a composite mixture of two reactive mesogens with different light reaction speeds. The first compound (faster reaction) ensures rapid initial curing, while the second compound (slower reaction) ensures complete curing of remaining material. This composite approach achieves both high curing completeness and short exposure time, thereby maintaining high productivity
4Productivity
If a reactive mesogen with high light reaction speed is used to decrease curing time, then productivity is improved, but exposure stains are generated by partial curing of the RM when loaded
Solution Approach 1:
The patent employs a composite system of two reactive mesogens where the first compound (faster reaction) and second compound (slower reaction) work synergistically. The slower-reacting second compound ensures uniform curing throughout the liquid crystal layer, preventing exposure stains, while the faster-reacting first compound maintains overall short curing time for high productivity
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 reduces manufacturing time and prevents exposure stains, thereby improving the productivity and display quality of LCD panels by optimizing the light reaction speed of the reactive mesogens.
Implementation Method 1
curing the reactive mesogens on the first alignment film to form a first mesogen layer and curing the reactive mesogens on the second alignment film to form a second mesogen layer
Data Source
AI summary
A method for manufacturing a liquid crystal display panel by providing a first substrate and providing a first alignment film, providing a second substrate and providing a second alignment film; interposing a liquid crystal compound and at least two reactive mesogens between the first and second substrates, where the two reactive mesogens are selected from Chemical Formulas 1 and 2; curing the reactive mesogens to form a first mesogen layer; and a second mesogen layer, whereinwherein in Chemical Formula 1 A and B are each independently selected from the group consisting ofand wherein at least one hydrogen atom of a naphthalene group is independently replaced with at least one of F and Cl andwherein in Chemical Formula 2, D is selected from at least one ofand a single bond, wherein E and G are each independently selected from at least one ofand wherein at least one hydrogen atom of a phenyl group are independently replaced with at least one ofF and Cl.