Liquid Crystal Display Device Blocking Layer Impurity Migration
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Solution Overview
Problem
Liquid crystal display devices face issues with display defects such as white streaks, variations in alignment, and image sticking due to impurities in the liquid crystal layer, primarily 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 diketopyrrolopyrrole-based red pigment, where the liquid crystal composition includes compounds represented by certain general formulas and the color filter has RGB three-color pixel portions with specific pigments, optimizing the interaction between the liquid crystal and color filter materials to minimize impurity effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the color filter layer is made thicker to improve color display quality, then the color filter performance is improved, but impurities from the color filter layer can more easily migrate to the liquid crystal layer, causing display defects
Solution Approach 1:
The patent introduces an intermediary layer (blocking layer or barrier layer) between the color filter layer and the liquid crystal layer. This intermediary layer acts as a mediator that prevents impurity migration while allowing the color filter layer to maintain its thickness for optimal color display performance. The blocking layer is specifically designed to block impurity diffusion while maintaining electrical functionality.
Solution Approach 2:
The patent extracts and removes harmful impurities from the color filter layer through purification processes before the color filter is formed. By taking out the harmful substances (such as organic solvents and other contaminants) from the color filter material, the patent reduces the source of impurities that would otherwise migrate to the liquid crystal layer and cause display defects.
2Manufacturing precision
If the alignment film thickness is reduced to improve display quality, then the display performance is improved, but impurities from the alignment film can more easily migrate to the liquid crystal layer
Solution Approach 1:
The patent introduces an intermediary blocking layer between the alignment film and the liquid crystal layer. This blocking layer serves as a protective barrier that prevents impurities from the thin alignment film from migrating to the liquid crystal layer, while still allowing the alignment film to maintain its optimized thin thickness for improved display quality.
Solution Approach 2:
The patent applies a blocking layer beforehand between the alignment film and liquid crystal layer to cushion against potential impurity migration. This preventive measure is implemented in advance during the manufacturing process, creating a protective barrier that prevents harmful effects before they can occur.
3Reliability
If the transparent electrode thickness is increased to improve electrical conductivity, then the electrical performance is improved, but the separation between the color filter layer and liquid crystal layer is reduced, allowing impurity migration
Solution Approach 1:
The patent introduces an intermediary blocking layer between the transparent electrode and the liquid crystal layer. This blocking layer acts as an additional barrier that prevents impurities from the color filter layer from migrating through the electrode structure to the liquid crystal layer, while the transparent electrode maintains its optimized thickness for electrical conductivity.
Data Source
AI summary
The present invention provides a liquid crystal display device that prevents a decrease in the voltage holding ratio (VHR) and an increase in the ion density (ID) in the liquid crystal layer, and resolves the problems of display defects, such as white streaks, variations in alignment, and image sticking. Since a liquid crystal display device according to the present invention has a feature of preventing a decrease in the voltage holding ratio (VHR) and an increase in the ion density (ID) in the liquid crystal layer, and suppressing the occurrence of display defects such as image sticking, the liquid crystal display device is particularly useful for active matrix driving liquid crystal display devices with an IPS mode or an FFS mode and can be applied to liquid crystal display devices such as liquid crystal televisions, monitors, cellular phones, and smart phones.