Liquid crystal composition, preparation method of the same, and display panel

Patent metadata

Field	Value
Publication number	US-12528989-B2
Application number	US-202218015570-A
Country	US
Kind code	B2
Filing date	Feb 8, 2022
Priority date	Feb 8, 2022
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

A liquid crystal composition has a mixture of rod-shaped monomer molecules, a chiral agent, and a mixture of multiple bent molecules. A method for preparing the liquid crystal composition includes mixing the mixture of rod-shaped monomer molecules, a chiral agent and a mixture of bent molecules in an organic solvent, and evaporating the organic solvent from the liquid crystal mixture to obtain the liquid crystal composition. A display panel has a layer of the liquid crystal composition disposed between a first substrate and a second substrate.

First claim

What is claimed is:

1 . A liquid crystal composition comprising, a mixture of rod-shaped monomer molecules, a chiral agent, and a mixture of bent molecules, wherein the mixture of bent molecules comprises multiple bent molecules,
wherein the mixture of bent molecules comprises a first compound, a second compound, a third compound, a fourth compound, a fifth compound, and a sixth compound, wherein the first compound has a molecular formula of

the second compound has a molecular formula of

the third compound has the molecular formula of

the fourth compound having a molecular formula of

the fifth compound having the molecular formula of

and
the sixth compound having the molecular formula of

wherein the first compound accounts for 55% to 65% by weight in the mixture of bent molecules, the second compound accounts for 10% to 15% by weight in the mixture of bent molecules, the third compound accounts for 8% to 13% by weight in the mixture of bent molecules, the fourth compound accounts for 5% to 10% by weight in the mixture of bent molecules, the fifth compound accounts for 3% to 7% by weight in the mixture of bent molecules, and the sixth compound accounts for 2% to 6% by weight in the mixture of bent molecules.

2 . The liquid crystal composition according to claim 1 , wherein each bent molecule of the multiple bent molecules has a bending elastic constant less than a torsion elastic constant.

3 . The liquid crystal composition according to claim 1 , wherein the mixture of the bent molecules in the liquid crystal composition has a less weight percent than that of the mixture of rod-shaped monomer molecules in the liquid crystal composition.

4 . The liquid crystal composition according to claim 1 , wherein the mixture of the bent molecules accounts for 30% to 70% by weight in the liquid crystal composition, the mixture of rod-shaped monomer molecules accounts for 30% to 70% by weight in the liquid crystal composition, and the chiral agent accounts for 0.5% to 10% by weight in the liquid crystal composition.

5 . The liquid crystal composition according to claim 1 , wherein the mixture of bent molecules accounts for 40% to 60% by weight in the liquid crystal composition, the mixture of rod-shaped monomer molecules accounts for 40% to 55% by weight in the liquid crystal composition, and the chiral agent accounts for 0.5% to 5% by weight in the liquid crystal composition.

6 . The liquid crystal composition according to claim 1 , wherein the mixture of rod-shaped monomer molecules is selected from at least two of the following compounds:

wherein J is a C 2 , C 5 or C 7 alkyl group, or a C 2 -C 6 or Cs alkoxy group; L is a C 1 -C 2 alkoxy group and Nis a C 2 -C 5 alkyl chain; P is a C 2 , C 3 or Cs alkyl chain, and O is a methyl group or C 2 methoxy group, wherein P is the C 3 or Cs alkyl chain when O is the methyl group, and P is the C 2 , C 3 or C 5 alkyl chain when O is the C 2 methoxy group; Q is a C 2 or C 3 alkyl chain; R is a C 1 , C 3 or Cs alkoxy, S is a C 3 or Cs alkyl chain; U is a C 2 or C 3 alkyl chain when Tis methyl, and U is the C 2 , C 3 or C 5 methyl chain when T is a C 2 methoxy.

7 . The liquid crystal composition according to claim 1 , wherein the chiral agent is selected from at least one of CB15, S811, R811, S1011, R1011, S2011, R2011, S5011 and R5011.

8 . The liquid crystal composition according to claim 1 , wherein the mixture of rod-shaped monomer molecules comprises a first monomer, a second monomer, a third monomer, a fourth monomer, a fifth monomer, a sixth monomer and a seventh monomer;
the first monomer has a molecular formula of

the second monomer has a molecular formula of

the third monomer has a molecular formula of

the fourth monomer has the molecular formula of

the fifth monomer has the molecular formula of

the sixth monomer has the molecular formula of

and
the seventh monomer having the molecular formula of

wherein the first monomer accounts for 55% to 65% by weight in the mixture of rod-shaped monomer molecules, the second monomer accounts for 15% to 20% by weight in the mixture of rod-shaped monomer molecules, the third monomer accounts for 5% to 15% by weight in the mixture of rod-shaped monomer molecules, the fourth monomer accounts for 2% to 7% by weight in the mixture of rod-shaped monomer molecules, the fifth monomer accounts for 2% to 5% by weight in the mixture of rod-shaped monomer molecules, the sixth monomer accounts for 2% to 5% by weight in the mixture of rod-shaped monomer molecules, and the seventh monomer accounts for 2% to 5% by weight in the mixture of rod-shaped monomer molecules.

9 . A method for preparing a liquid crystal composition, comprising:
mixing a mixture of rod-shaped monomer molecules, a chiral agent and a mixture of bent molecules in an organic solvent to obtain a liquid crystal mixture, wherein the mixture of bent molecules comprises multiple bent molecules; and evaporating the organic solvent from the liquid crystal mixture to obtain the liquid crystal composition, wherein the mixture of bent molecules comprises a first compound, a second compound, a third compound, a fourth compound, a fifth compound, and a sixth compound, wherein the first compound has a molecular formula of

the second compound has a molecular formula of

the third compound has the molecular formula of

the fourth compound having a molecular formula of

the fifth compound having the molecular formula of

and
the sixth compound having the molecular formula of

where

Assignees

• Beijing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Wu Xiaojuan
• Wang Jian
• Wang Jiaxing

Classifications

• C09K2019/3016

  Cy-Ph-Ph · CPC title

• C09K2019/525

  Solvents · CPC title

• C09K19/588

  Heterocyclic compounds · CPC title

• C09K2019/0466

  the linking chain being a -CF2O- chain · CPC title

• C09K2019/3004

  Cy-Cy · CPC title