Liquid Crystal Display Device Impurity Resistance
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Solution Overview
Problem
Liquid crystal display devices face issues such as white spots, alignment unevenness, and image sticking due to impurities in the color filter layer affecting the voltage holding ratio and ion density of the liquid crystal layer, which existing methods have not adequately addressed.
Innovation Solution
A liquid crystal display device utilizing a specified liquid crystal composition and color filter with specific dyes and pigments, including compounds represented by general formulas and specific RGB pixel portions, to prevent decreases in voltage holding ratio and increases in ion density, thereby resolving display defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional color filter layer is used, then the display device can be manufactured with standard materials, but impurities in the color filter layer cause display defects such as white spots, alignment unevenness, and image sticking
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid crystal material by introducing specific compounds with fluorine atoms at terminal positions (compounds of formula (1) and (2)). This parameter change modifies the liquid crystal's interaction with impurities from the color filter layer, preventing impurity-induced display defects while maintaining normal display functionality.
Solution Approach 2:
The patent uses a composite liquid crystal composition containing multiple specific compounds: compounds of formula (1) with fluorine-terminal groups, compounds of formula (2) with specific molecular structures, and compounds of formula (3) as additives. This composite material approach creates synergistic effects that enhance impurity resistance while maintaining display performance.
2Device complexity
If the alignment film and transparent electrode are made thin to maintain device structure, then the device can be manufactured with standard thickness specifications, but the color filter layer and liquid crystal layer are not completely isolated, allowing impurity migration
Solution Approach 1:
The patent changes the chemical parameters of the liquid crystal material to include compounds with fluorine-terminal groups (formula (1)) and specific molecular structures (formula (2)). These parameter changes create a liquid crystal composition that is chemically resistant to impurity migration through thin alignment films and transparent electrodes, effectively isolating the liquid crystal layer from color filter impurities without increasing layer thickness.
3Ease of manufacture
If standard liquid crystal materials are used, then the device can be manufactured with conventional materials, but voltage holding ratio decreases and ion density increases due to impurity interaction
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific compounds: fluorine-terminal compounds (formula (1)), compounds with specific core structures (formula (2)), and additive compounds (formula (3)). These parameter changes modify the liquid crystal's chemical properties to resist impurity interaction, preventing voltage holding ratio degradation and ion density increase while maintaining manufacturability.
Solution Approach 2:
The patent employs a composite liquid crystal material system combining multiple specific compounds in defined proportions. This composite approach creates a robust liquid crystal composition that collectively resists impurity-induced voltage holding ratio decrease and ion density increase, while remaining compatible with conventional manufacturing processes.
Data Source
AI summary
There is provided a liquid crystal display device capable of preventing a decrease in voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) and resolving the problem of display defects such as white spots, alignment unevenness, image sticking, and the like. The liquid crystal display device prevents a decrease in voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) and suppresses the occurrence of display defects such as image sticking, and the like. The liquid crystal display device is useful for an IPS-mode or FES-mode liquid crystal display device for active matrix driving. The application of the device can include liquid crystal TVs, monitors, cellular phones, smart phones, and the like.