7-Hydrogen Benzoanthracene Liquid Crystal Compound

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Solution Overview

Problem

Existing liquid crystal materials have a relatively low clearing point, limiting the application scope of liquid crystal displays.

Innovation Solution

A new liquid crystal compound of the 7-hydrogen benzo[de]anthracene type with a bi-cyclohexyl moiety is developed, which has a higher clearing point, achieved through a multi-step synthesis process involving bromination, Grignard reactions, and dehydration, resulting in a compound with a clearing point up to 295°C.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If existing liquid crystal materials are used, then the manufacturing cost is low, but the clearing point is relatively low (about 100°C) which limits the application scope

Engineering Contradiction:

Improveclearing pointVSAvoidmanufacturing complexity

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent changes the chemical structure parameters of liquid crystal compounds by introducing specific molecular groups and configurations to achieve a clearing point of 295°C, significantly improving the temperature parameter while maintaining manufacturability through established synthesis routes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention develops new liquid crystal compounds with complex molecular structures that combine multiple functional groups, creating composite molecular architectures that achieve high clearing points while preserving ease of manufacture through systematic synthetic approaches

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If the clearing point is increased to broaden application scope, then the application scope is improved, but the synthesis process becomes more complex with multiple steps

Engineering Contradiction:

Improveapplication scopeVSAvoidsynthesis process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The synthesis process is segmented into four distinct steps (bromination, Grignard reaction, second bromination, and final synthesis), allowing each step to be optimized independently and facilitating systematic control of the complex overall process

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs preliminary bromination reactions to introduce functional groups at specific positions before subsequent reactions, pre-positioning reactive sites that simplify later synthesis steps and enable precise molecular architecture control

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9206354B1Liquid crystal compound and methods for the preparation thereof

Publication Date: 2015.12.08 BOE TECHNOLOGY GROUP CO LTD

AI summary

The disclosure relates to a liquid crystal compound having a structure of the general formula P2, wherein, R1 represents C1-C8 alkyl, R2 and R3, which independently represent C1-C6 alkyl, and R4 represents C1-C6 alkyl. The disclosure also relates to a process for the preparation of the liquid crystal compound, a liquid crystal composition comprising the liquid crystal compound, and a liquid crystal display panel comprising the liquid crystal compound.