Liquid crystal composition and liquid crystal display device thereof

Patent metadata

Field	Value
Publication number	US-12497564-B2
Application number	US-202218553764-A
Country	US
Kind code	B2
Filing date	Apr 8, 2022
Priority date	Apr 15, 2021
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

A liquid crystal composition includes at least one compound represented by formula I and at least one compound represented by formula II. The liquid crystal composition has a relatively large absolute value of dielectric anisotropy, a relatively large K value, a relatively long low-temperature storage time period, a relatively low polymer layer surface roughness, a relatively small pre-tilt angle, a relatively fast speed for forming pre-tilt angle, a relatively low polymer residue, a relatively high VHR and a relatively good pre-tilt angle stability, while maintaining appropriate clearing points, optical anisotropy and rotational viscosity. A liquid crystal display device containing the liquid crystal composition has a relatively wide temperature usage range, relatively good contrast, and relatively good low-temperature mutual solubility. In addition, the production process of PSA-type liquid crystal displays is improved, and at the same time, the problems of “image sticking”, uneven display and “broken bright spots”.

First claim

The invention claimed is:

1 . A liquid crystal composition comprising:
at least one compound of general formula I:

and
at least one compound of general formula II:

wherein,
R 1 represents C 1-5 linear or C 3-5 branched, halogenated or unhalogenated alkyl;
R 2 represents —H, halogen, —CN, -Sp 2 -P 2 or C 1-12 linear or C 3-12 branched alkyl,

wherein one or more than two nonadjacent —CH 2 — in the C 1-12 linear or C 3-12 branched alkyl,

can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—, one or more —H can each be independently substituted by —F or —Cl;
R 3 represents —H, halogen, C 1-12 linear or C 3-12 branched alkyl,

wherein one or more than two nonadjacent —CH 2 — in the C 1-12 linear or C 3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO— in a manner that —O— are not directly connected to each other, and one or more —H on the C 1-12 linear or C 3-12 branched alkyl,

can each be independently substituted by —F or —Cl;
ring

and ring

each independently represents

or

wherein one or more —CH 2 — in

can be replaced by —O—, and one or more single bond in the ring can be replaced by double bond, wherein one or more —H on

can each be independently substituted by —F, —Cl or —CN, and one or more —CH═ in the ring can be replaced by —N═;
A represents

wherein one or more —CH 2 — n

can each be independently replaced by X 1 or X 2 , and one or more single bond in the ring can be replaced by double bond, wherein X 1 represents —O— or —S—, X 2 represents C 1-5 linear alkyl;
L each independently represents halogen, —CN or -Sp 2 -P 2 ;
L 1 and L 2 each independently represents —H, halogen, C 1-3 halogenated alkyl or C 1-3 halogenated alkoxy;
P 1 and P 2 each independently represents polymerizable group;
Sp 1 and Sp 2 each independently represents spacer group or single bond;
X represents —CO— or —CF 2 —;
Z 1 and Z 2 each independently represents —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, —CH 2 O—, —OCH 2 —, —CH 2 S—, —SCH 2 —, —CF 2 O—, —OCF 2 —, —CF 2 S—, —SCF 2 —, —(CH 2 ) n —, —CF 2 CH 2 —, —CH 2 CF 2 —, —(CF 2 ) n —, —CH═CH—, —CF═CF—, —CH═CF—, —CF═CH—, —C≡C—, —CH═CH—CO—O—, —O—CO—CH═CH—, —CH 2 CH 2 —CO—O—, —O—CO—CH 2 CH 2 —,−CR 1 R 2 — or single bond; wherein, R 1 and R 2 each independently represents —H or C 1-12 linear or C 3-12 branched alkyl, and n represents an integer of 1-4;
Z 3 , Z 4 and Z 5 each independently represents single bond, —CH 2 CH 2 —, —CF 2 CF 2 —, —CO—O—, —O—CO—, —O—CO—O—, —CH═CH—, —CF═CF—, —CH 2 O— or —OCH 2 —;
r 1 , r 2 and r 3 each independently represents 0, 1, 2 or 3, when r 1 , r 2 and r 3 each independently represents 2 or 3, L can be the same or different;
n 1 and n 2 each independently represents 0, 1 or 2, and n 1 +n 2 ≥1, when n 1 represents 2,

can be the same or different, when n 2 represents 2,

can be the same or different; and
n 3 represents 0, 1 or 2, n 4 represents 0 or 1, when n 3 represents 2, ring

can be the same or different, Z 3 can be the same or different.

2 . The liquid crystal composition according to claim 1 , wherein the compound of general formula II is selected from a group consisting of the following compounds:

wherein,
R 3 represents —H, halogen, C 1-12 linear or C 3-12 branched alkyl,

wherein one or more than two nonadjacent —CH 2 — in the C 1-12 linear or C 3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO— in a manner that —O— are not directly connected to each other, and one or more —H on the C 1-12 linear or C 3-12 branched alkyl,

can each be independently substituted by —F or —Cl;
ring

and ring

each independently represents

or

wherein one or more —CH 2 — in

can be replaced by —O—, and one or more single bond in the ring can be replaced by double bond, wherein one or more —H on

can each be independently substituted by —F, —Cl or —CN, and one or more —CH═ in the ring can be replaced by —N═;
X represents —CO— or —CF 2 —; and
Z 3 and Z 5 each independently represents single bond, —CH 2 CH 2 —, —CF 2 CF 2 —, —CO—O—, —O—CO—, —O—CO—O—, —CH═CH—, —CF═CF—, —CH 2 O— or —OCH 2 —.

3 . The liquid crystal composition according to claim 1 , wherein the liquid crystal composition further comprises at least one compound of general formula M:

wherein,
R M1 and R M2 each independently represents C 1-12 linear or C 3-12 branched alkyl,

wherein one or more than two nonadjacent —CH 2 — in the C 1-12 linear or C 3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—;
ring

Assignees

• Jiangsu Hecheng Display Tech

Inventors

• Zhao Tengyun
• Yang Yafei
• Ding Wenquan
• He Di
• Wang Panpan
• Xu Shuang

Classifications

• C09K2019/548

  stabilizing the alignment; Polymer stabilized alignment · CPC title

• C09K19/56

  Aligning agents · CPC title

• C09K19/542

  Macromolecular compounds · CPC title

• C09K19/3066 Primary

  in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers · CPC title

• C09K19/14

  linked by a carbon chain · CPC title