Liquid Crystal Display Voltage Holding Ratio Optimization
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Solution Overview
Problem
Liquid crystal display devices face issues with defective displays due to impurities in the color filter layer, leading to decreased voltage holding ratio, increased ion density, and problems like dropouts, uneven alignment, and screen burn-in, which existing techniques are insufficient to fully address.
Innovation Solution
A liquid crystal display device utilizing a specific liquid crystal composition and a color filter with a black matrix containing specific pigments, such as carbon black, titanium black, and organic pigments, to prevent these issues by optimizing the voltage holding ratio and ion density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the alignment film and transparent electrode is increased to enhance electric conductivity, then the electric conductivity is improved, but the color filter layer and liquid crystal layer are not completely isolated, allowing impurities to pass through and cause defective display
Solution Approach 1:
The patent changes the material composition parameters of the transparent electrode by incorporating specific oxide nanoparticles (silica, titania, zirconia) to simultaneously achieve high electric conductivity and low impurity passage. This parameter change in material composition allows the electrode to maintain thin thickness while blocking impurities from the color filter layer.
Solution Approach 2:
The patent uses composite materials by combining conventional transparent electrode materials with specific oxide nanoparticles (silica, titania, zirconia). This composite structure provides both the necessary electric conductivity and the impurity blocking function, resolving the contradiction between conductivity enhancement and impurity isolation.
2Reliability
If impurities are highly controlled in liquid crystal materials, then the electrical properties are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent introduces the transparent electrode with oxide nanoparticles as an intermediary barrier between the color filter layer and liquid crystal layer. This intermediary structure filters out impurities from the color filter layer before they can reach the liquid crystal layer, reducing the stringency of impurity control requirements for the liquid crystal materials themselves.
3Device complexity
If the thickness of the alignment film is reduced to not more than 0.1 μm, then the device structure is optimized, but impurities from the alignment film can more easily affect the liquid crystal layer
Solution Approach 1:
The patent positions the transparent electrode with oxide nanoparticles as an intermediary layer between the thin alignment film and the liquid crystal layer. This intermediary structure prevents impurities from the thin alignment film from reaching the liquid crystal layer, allowing the alignment film to maintain its optimized thin thickness without compromising liquid crystal layer purity.
Data Source
AI summary
The present invention provides a liquid crystal display device which prevents a decrease in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) therein and which overcomes problems of defective display such as dropouts, uneven alignment, and screen burn-in. The liquid crystal display device of the present invention prevents a decrease in the voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) therein and reduces defective display such as screen burn-in; hence, such a liquid crystal display device is properly used as liquid crystal display devices of a VA mode and PSVA mode which involve active matrix driving and can be applied to liquid crystal display devices of liquid crystal TV sets, monitors, mobile phones, and smartphones.