Sulfone-Group Liquid Crystal Compound for Viewing Angle Compensation
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Solution Overview
Problem
Liquid crystal displays (LCDs) suffer from viewing angle dependency, resulting in color and light variations when viewed from different angles, which is exacerbated by the size increase of display panels, leading to a need for high-quality viewing angle compensation films that improve contrast ratio and minimize color variations in a black state.
Innovation Solution
A novel liquid crystal compound containing a sulfone group, represented by Formulas 1 and 2, is used to create a liquid crystal composition that forms a polymerizable mesogenic core with improved workability and stability, allowing for the production of a high-quality viewing angle compensation film with enhanced optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional liquid crystal materials are used in LCD panels, then the device achieves basic display function, but viewing angle dependency causes color and light variations when viewed from different angles
Solution Approach 1:
The patent modifies the molecular structure of liquid crystal compounds by introducing sulfone groups and specific mesogenic cores, which changes the optical parameters (birefringence, refractive index) to reduce viewing angle dependency and maintain color consistency across different viewing directions
Solution Approach 2:
The patent creates composite liquid crystal compositions by combining multiple liquid crystal compounds with specific molecular structures (containing sulfone groups, cyclohexyl rings, and ester linkages) to achieve synergistic optical properties that improve viewing angle characteristics while maintaining color uniformity
2Area of stationary object
If the size of LCD display panel is increased, then the display area is enlarged, but the viewing angle decreases and viewing angle dependency increases
Solution Approach 1:
The patent develops liquid crystal compounds with optimized molecular parameters (molecular length, width, and flexibility) that maintain effective optical interaction over larger display areas, ensuring consistent viewing angle characteristics across the entire panel surface even as size increases
3Manufacturing precision
If optical compensation film is added to improve viewing angle characteristics, then the contrast ratio and color consistency are improved, but the device complexity and manufacturing process are increased
Solution Approach 1:
The patent designs liquid crystal compounds that simultaneously provide multiple functions: they serve as both the display medium and the optical compensation material, eliminating the need for separate compensation films while achieving improved viewing angle characteristics and color consistency
Solution Approach 2:
The patent merges the functions of the liquid crystal display layer and the optical compensation layer into a single liquid crystal composition, simplifying the overall device structure by removing additional film layers while maintaining or improving optical performance
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 liquid crystal composition effectively improves the contrast ratio and minimizes color variations across viewing angles, providing a superior optical film that maintains alignment and stability, even at room temperature, thus enhancing the performance of LCDs.
Implementation Method 1
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.
Data Source
AI summary
Disclosed are a novel liquid crystal compound containing a sulfone group, a liquid crystal composition comprising the same, and an optical film using the same liquid crystal composition. More particularly, there are provided a liquid crystal material for a viewing angle compensation film with high quality characteristics, which can improve a contrast ratio measured at a tilt angle to the front 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.