Fluorinated Liquid Crystal Compounds for Faster, UV-Stable Displays

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Solution Overview

Problem

Existing negative liquid crystal compounds suffer from small absolute value of dielectric anisotropy, large rotational viscosity, poor solubility at low temperatures, and instability under UV light, which affects the reliability and performance of liquid crystal display devices.

Innovation Solution

Development of a liquid crystal compound with a larger optical anisotropy, dielectric anisotropy, and reduced rotational viscosity, along with improved UV stability, achieved through specific molecular structures and compositions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If negative liquid crystal compounds are used to achieve high transmittance, then transmittance is improved, but rotational viscosity increases and voltage hold rate decreases

Engineering Contradiction:

ImprovetransmittanceVSAvoidresponse time

Core Design Contradiction:

Illumination intensityVSSpeed

Solution Approach 1:

The patent modifies the molecular structure of negative liquid crystal compounds by changing parameters such as introducing fluorine atoms at specific positions (e.g., 2-position and 6-position of the phenyl ring) and adjusting substituent groups. These parameter changes in molecular composition lead to optimized rotational viscosity and voltage hold rate while maintaining high transmittance characteristics

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops composite liquid crystal compositions by combining multiple compounds with different molecular structures and properties. The composition includes a negative liquid crystal compound with specific molecular features combined with other compatible compounds, achieving a balance between high transmittance, low rotational viscosity, and high voltage hold rate through synergistic effects

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional benzofuran and benzothiophene compounds are used, then certain liquid crystal properties are achieved, but UV stability deteriorates

Engineering Contradiction:

ImproveUV stabilityVSAvoidUV light degradation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the molecular structure by introducing fluorine atoms at specific positions (2-position and 6-position of the phenyl ring) and modifying substituent groups. These parameter changes enhance the molecular stability and resistance to UV light degradation, solving the UV stability problem of conventional compounds

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harmful effect of UV light into a beneficial outcome by designing molecular structures that are specifically resistant to UV degradation. The fluorinated molecular structure absorbs UV energy in a way that prevents degradation, transforming a potential harm into enhanced reliability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If existing negative liquid crystal compounds are used, then liquid crystal display function is achieved, but dielectric anisotropy absolute value is small

Engineering Contradiction:

Improvedielectric anisotropyVSAvoiddisplay performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent modifies the molecular structure by introducing fluorine atoms and adjusting substituent groups, which changes the dielectric properties of the liquid crystal compound. These parameter changes increase the absolute value of dielectric anisotropy, improving display performance and voltage hold characteristics

Inventive Principle:

Principle #35Parameter changes

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 new liquid crystal compound enhances the reliability and performance of liquid crystal displays by maintaining high contrast, faster response times, and improved UV resistance, suitable for VA-TFT, IPS, and FFS display devices.

Implementation Method 1

The liquid crystal compound has a larger optical anisotropy

Methodology Applied

Scientific EffectOptical anisotropy: Birefringence

Implementation Method 2

The liquid crystal compound has a larger absolute value of dielectric anisotropy

Methodology Applied

Scientific EffectDielectric anisotropy: Dielectric

Implementation Method 3

The liquid crystal composition has a nematic phase

Methodology Applied

Scientific EffectPhase change: Phase Change

Data Source

PatentUS12460133B2Liquid crystal compound, liquid crystal composition thereof, and liquid crystal display device

Publication Date: 2025.11.04 JIANGSU HECHENG DISPLAY TECH CO LTD

AI summary

A liquid crystal compound represented by general formula F is useful as a liquid crystal composition and as a liquid crystal display device that contains the liquid crystal composition. The liquid crystal compound has a large clearing point, large optical anisotropy and sizable or large dielectric anisotropy absolute value under the condition of maintaining a suitable rotary viscosity, enabling the liquid crystal composition that contains the compound represented by general formula F has a large optical anisotropy, small rotational viscosity, high VHR (UV) and long low-temperature storage duration under the condition of maintaining proper clearing point, proper dielectric anisotropy absolute value and proper VHR (initial), and the liquid crystal display device that contains the liquid crystal composition of the present invention has good contrast, high response speed, high reliability and good low-temperature storage stability.