Discotic Liquid Crystal Compound for LCD Viewing Angle Compensation
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Solution Overview
Problem
Liquid crystal displays (LCDs) suffer from viewing angle dependency, leading to color variations and reduced contrast ratio, especially as display sizes increase, due to birefringence effects and light phase differences, necessitating a high-quality viewing angle compensation film.
Innovation Solution
A discotic liquid crystal compound represented by Formula 1, with a polymerizable group and linking group, is used to create a liquid crystal composition that forms an optical film with improved viewing angles, stability, and solubility, suitable for TN mode or O-plate compensation films, minimizing light leakage in black states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional liquid crystal displays are used, then the display is light and thin with low power consumption, but the viewing angle is limited to about ±50° with significant color variations and contrast ratio degradation
Solution Approach 1:
The patent introduces a new discotic liquid crystal compound with specific molecular structure (Formula 1) that changes the optical parameters of the display system. The compound has a triphenylene core with specific substituents that provide optimal birefringence and alignment properties, enabling wide viewing angle compensation while maintaining color accuracy and contrast ratio.
Solution Approach 2:
The invention creates a composite liquid crystal composition by combining the newly synthesized discotic liquid crystal compound with other liquid crystal materials. This composite formulation achieves synergistic effects that provide both wide viewing angle compensation and high image quality with minimal color variations and excellent contrast ratio.
2Area of stationary object
If the display panel size is increased, then the display area is expanded, but the viewing angle decreases and image quality deteriorates
Solution Approach 1:
The discotic liquid crystal compound in Formula 1 provides consistent optical compensation parameters across large display areas. The molecular structure ensures uniform alignment and birefringence properties that maintain viewing angle performance regardless of panel size, solving the degradation issue in large-screen displays.
3Ease of operation
If viewing angle compensation is implemented using conventional liquid crystal compounds, then the viewing angle is improved, but color variations in black state and contrast ratio are not adequately minimized
Solution Approach 1:
The patent applies local quality optimization by designing the discotic liquid crystal compound with specific functional groups positioned at particular locations on the triphenylene core. The substituents (V, X, A, W, Y groups) are strategically placed to provide localized optical properties that compensate for viewing angle issues while maintaining excellent black state uniformity and contrast ratio across the entire display.
Solution Approach 2:
The novel compound structure in Formula 1 changes the key optical parameters including birefringence value, alignment angle, and phase difference characteristics. These parameter changes enable simultaneous achievement of wide viewing angle compensation and high image quality with minimal color variations and superior contrast ratio.
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
The discotic liquid crystal compound enhances the viewing angle of LCDs, maintaining alignment stability and solubility, resulting in a high-quality optical film that reduces color variations and improves contrast ratio across different viewing angles.
Implementation Method 1
coating an aligned transparent support with liquid crystal, and aligning the liquid crystal along a predetermined direction to the direction of an aligning layer
Implementation Method 2
The above-mentioned viewing angle dependency of an LCD is caused by the incident light having a tilt angle to an LCD panel, which shows a birefringence effect different from that of the vertical incident light
Implementation Method 3
followed by curing
Data Source
AI summary
Disclosed is a discotic liquid crystal compound, a liquid crystal composition comprising the same, and an optical film using the same liquid crystal composition. More particularly, there is provided a liquid crystal material of a viewing angle compensation film with high quality characteristics, which can improve a contrast ratio and minimize variations in color with viewing angles in a black state, a liquid crystal composition comprising the same liquid crystal material, and a compensation film obtained from the same liquid crystal composition.