Liquid Crystal Display Device Impurity Barrier
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Solution Overview
Problem
Liquid crystal display devices face issues with faulty displays such as white missing pixels, alignment inconsistencies, and burn-in due to impurities in the liquid crystal layer, particularly from the color filter layer, which affect the voltage holding ratio and ion density.
Innovation Solution
A liquid crystal display device incorporating a specific liquid crystal composition and a color filter with a black matrix containing specific pigments, such as carbon blacks, titanium blacks, and organic pigments, to mitigate the impact of impurities and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the thickness of the transparent electrode is increased to increase electrical conductivity, then electrical conductivity is improved, but the isolation between the color filter layer and liquid crystal layer is reduced, allowing more impurities to migrate
Solution Approach 1:
An alignment film is introduced as an intermediary layer between the transparent electrode and the liquid crystal layer. This alignment film serves as a barrier to impurity migration while still allowing the transparent electrode to provide sufficient electrical conductivity. The alignment film's specific structure and material properties enable it to block impurity transport pathways without compromising the overall device performance.
2Illumination intensity
If conventional pigments are used in the color filter layer to achieve desired color display, then color display performance is improved, but impurity elution into the liquid crystal layer increases, causing faulty display
Solution Approach 1:
The invention changes the chemical and physical parameters of the pigment materials used in the color filter layer. Specifically, pigments are selected or modified to have reduced solubility and elution characteristics in the liquid crystal environment. This parameter change allows the color filter to maintain its color display function while significantly reducing impurity migration into the liquid crystal layer.
3Object-affected harmful factors
If the thickness of the alignment film is reduced to minimize impurity migration, then impurity barrier function is improved, but the film becomes more susceptible to defects and manufacturing variations
Solution Approach 1:
The alignment film is designed as a composite material structure with specific compositional ratios and layered configurations. This composite structure provides enhanced mechanical stability and defect resistance while maintaining the impurity barrier function. The combination of different materials in the alignment film creates a synergistic effect that simultaneously improves film reliability and impurity blocking capability.
Data Source
AI summary
There is provided a liquid crystal display device that may limit a reduction in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in the ion density (ID) in the liquid crystal layer and thereby address issues of faulty display such as white missing pixels, alignment inconsistencies, and burn-in. The liquid crystal display device according to the present invention, which may limit a reduction in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in the ion density (ID) in the liquid crystal layer and thereby reduce the risk of faulty display such as burn-in, can be suitably used, in particular, as an IPS-mode or FFS-mode liquid crystal display device for active-matrix driving and may also be used as a liquid crystal display device for liquid crystal display televisions, monitors, mobile phones, smart phones, or the like.