Psa-type liquid crystal composition and display device having same

Patent metadata

Field	Value
Publication number	US-2020332195-A1
Application number	US-202016832251-A
Country	US
Kind code	A1
Filing date	Mar 27, 2020
Priority date	Apr 16, 2019
Publication date	Oct 22, 2020
Grant date	—

Abstract

A PSA-type liquid crystal composition includes a host liquid crystal A and a polymerizable component B, where the host liquid crystal A includes one or more liquid crystal compounds, and the polymerizable component B includes at least one compound selected from compounds of general formula I-1, general formula I-2 and general formula I-3. A liquid crystal display device includes the PSA-type liquid crystal composition above. The PSA-type liquid crystal composition has better intersolubility, cannot be crystallized at a low-temperature environment, can form a relatively stable pretilt angle after the polymerization of the polymerizable component, avoids the image sticking, and inhibits the occurrence of a display defect, such as Zara Particle, during the polymerization.

First claim

What is claimed is:

1 . A PSA-type liquid crystal composition comprising:
a host liquid crystal A and a polymerizable component B, wherein the host liquid crystal A comprises one or more liquid crystal compounds, and the polymerizable component B comprises at least one compound selected from a group consisting of the compounds of general formula I-1, general formula I-2 and general formula I-3:

in which,
ring A, ring B, ring C, ring D, ring E, ring F, ring G, ring H and ring I each independently represents phenylene or naphthylene;
X 1-1 , X 1-2 , X 1-3 , X 2-1 , X 2-2 , X 2-3 , X 2-4 , X 3-1 , X 3-2 , X 3-3 , X 3-4 and X 3-5 each independently represents a single bond, or a C 1-12 linear or branched alkylene, wherein one or more —CH 2 — in the C 1-12 linear or branched alkylene can be replaced by —O—, —S—, —NH—, —CO—, —CH═CH— or —C≡C— in a manner that heteroatoms are not directly connected to each other, —H in one or more —CH 2 — in the C 1-12 linear or branched alkylene can be substituted by halogen, and wherein at least one of X 1-1 , X 1-2 and X 1-3 represents a single bond, at least one of X 2-1 , X 2-2 , X 2-3 and X 2-4 represents a single bond, and at least one of X 3-1 , X 3-2 , X 3-3 , X 3-4 and X 3-5 represents a single bond;
R A , R B , R C , R D , R E , R F , R G , R H and R I each independently represents halogen, or a C 1-5 halogenated or unhalogenated linear or branched alkyl or alkoxy;
P 1-1 , P 1-2 , P 2-1 , P 2-2 , P 3-1 and P 3-2 each independently represents a polymerizable group;
a, b, c, d, e, f, g, h and i each independently represents 0, 1, 2 or 3, and when a is 2 or 3, R A can be same or different; when b is 2 or 3, R B can be same or different; when c is 2 or 3, R C can be same or different; when d is 2 or 3, R D can be same or different; when e is 2 or 3, R E can be same or different; when f is 2 or 3, R F can be same or different; when g is 2 or 3, R G can be same or different; when h is 2 or 3, R H can be same or different; when i is 2 or 3, R I can be same or different;
a+b+n 1 ≥1, and n 1 ≥1, wherein n 1 represents the number of groups that are not single bond in X 1-1 , X 1-2 and X 1-3 ;
c+d+e+n 2 ≥2, and n 2 ≥1, wherein n 2 represents the number of groups that are not single bond in X 2-1 , X 2-2 , X 2-3 and X 2-4 ; and
f+g+h+i+n 3 ≥3, and n 3 ≥1, wherein n 3 represents the number of groups that are not single bond in X 3-1 , X 3-2 , X 3-3 , X 3-4 and X 3-5 .

2 . The PSA-type liquid crystal composition according to claim 1 , wherein a+b+n 1 ≥2; c+d+e+n 2 ≥3; and f+g+h+i+n 3 ≥4.

3 . The PSA-type liquid crystal composition according to claim 1 , wherein X 1-2 , X 2-2 , X 2-3 , X 3-2 , X 3-3 and X 3-4 each independently represents a single bond, —CH 2 O—, —OCH 2 —, —CH 2 CH 2 —, —(CH 2 ) 3 —, —(CH 2 ) 4 —, —(CH 2 ) 3 O—, —O(CH 2 ) 3 —, —O—, —CF 2 —, —CF 2 O—, —OCF 2 —, —CH(CH 3 )CH 2 —, —C(CH 3 ) 2 CH 2 —, —CH 2 C(CH 3 ) 2 —, —C(CH 3 ) 2 CH(CH 3 )—, —C(CH 3 ) 2 C(CH 3 ) 2 —, —C(CH 3 ) 2 O—, —OC(CH 3 ) 2 —, —CH(CH 2 CH 3 )CH 2 —, —S—, —NH—, —NH—CO—O—, —O—CO—NH—, —SCH 2 —, —CH 2 S—, —CH═CH—, —C≡C—, —CH═CH—CO—O— or —O—CO—CH═CH.

4 . The PSA-type liquid crystal composition according to claim 1 , wherein if X 1-2 represents —CO— or —O—CO—, then a+b≠0; if both X 2-2 and X 2-3 represent —CO—O— or —O—CO—, then c+d+e≠0; if all of X 3-2 , X 3-3 and X 3-4 represent —CO—O— or —O—CO—, then f+g+h+i≠0.

5 . The PSA-type liquid crystal composition according to claim 1 , wherein both X 1-1 and X 1-3 represent single bond, and X 1-2 represents —CH 2 O—, —OCH 2 —, —CO—O—, —O—CO—, —CH 2 CH 2 —, —(CH 2 ) 3 —, —(CH 2 ) 4 —, —(CH 2 ) 3 O—, —O(CH 2 ) 3 —, —O—, —CF 2 —, —CF 2 O—, —OCF 2 —, —CH(CH 3 )CH 2 —, —C(CH 3 ) 2 CH 2 —, —CH 2 C(CH 3 ) 2 —, —C(CH 3 ) 2 CH(CH 3 )—, —C(CH 3 ) 2 C(CH 3 ) 2 —, —C(CH 3 ) 2 O—, —OC(CH 3 ) 2 —, —CH(CH 2 CH 3 )CH 2 —, —S—, —NH—, —NH—CO—O—, —O—CO—NH—, —SCH 2 —, —CH 2 S—, —CH═CH—, —C≡C—, —CH═CH—CO—O— or —O—CO—CH═CH.

6 . The PSA-type liquid crystal composition according to claim 1 , wherein the polymerizable component B only comprises one compound of general formula I-1, wherein both X 1-1 and X 1-3 represent single bond, X 1-2 represents —CH 2 O—, —OCH 2 —, —CO—O—, —O—CO—, —CH 2 CH 2 —, —(CH 2 ) 3 —, —(CH 2 ) 4 —, —(CH 2 ) 3 O—, —O(CH 2 ) 3 —, —O—, —CF 2 —, —CF 2 O—, —OCF 2 —, —CH(CH 3 )CH 2 —, —CH 2 C(CH 3 ) 2 —, —C(CH 3 ) 2 CH 2 —, —C(CH 3 ) 2 CH(CH 3 )—, —C(CH 3 ) 2 C(CH 3 ) 2 —, —C(CH 3 ) 2 O—, —OC(CH 3 ) 2 —, —CH(CH 2 CH 3 )CH 2 —, —S—, —NH—, —NH—CO—O—, —O—CO—NH—, —SCH 2 —, —CH 2 S—, —CH═CH—, —C≡C—, —CH═CH—CO—O— or —O—CO—CH═CH—, and a+b 0.

7 . The PSA-type liquid crystal composition according to claim 1 , wherein if the polymerizable component B comprises one compound of general formula I-1 in which a+b+n=1, it at least further comprises another compound selected from a group consisting of the compounds of general formula I-1, general formula I-2 and general formula I-3.

8 . The PSA-type liquid crystal composition according to claim 1 , wherein at least one of X 2-1 and X 2-4 represents a single bond; and when both X 2-1 and X 2-4 represent single bond, at least one of X 2-2 and X 2-3 is not a single bond, and c+d+e≥1.

9 . The PSA-type liquid crystal composition according to claim 1 , wherein if the polymerizable component B comprises two or three polymerizable compounds, and at least one of said two or three polymerizable compounds is selected from the compounds of general formula I-2, at least one of X 2-1 and X 2-4 represents a single bond, and when both X 2-1 and X 2-4 represent single bond, at least one of X 2-2 and X 2-3 is not a single bond, and c+d+e≥1.

10 . The PSA-type liquid crystal composition according to claim 1 , wherein at least one of X 3-1 and X 3-5 represents a single bond; and when both X 3-1 and X 3-5 are single bond, at least one of X 3-2 , X 3-3 and X 3-4 is not a single bond, and f+g+h+i≥2; when only one of X 3-1 and X 3-5 represents a single bond, at most one of X 3-2 , X 3-3 and X 3-4 is not a single bond, and f+g+h+i≥2.

11 . The PSA-type liquid crystal composition according to claim 1 , wherein if the polymerizable component B comprises two or three polymerizable compounds, and at least one of said two or three polymerizable compounds is selected from the compounds of general formula I-3, at least one of X 3-1 and X 3-5 represents a single bond; when both X 3-1 and X 3-5 are single bond, at least one of X 3-2 , X 3-3 and X 3-4 is not a single bond, and f+g+h+i≥2; when only one of X 3-1 and X 3-5 represents a single bond, at most one of X 3-2 , X 3-3 and X 3-4 is not a single bond, and f+g+h+i≥2.

12 . The PSA-type liquid crystal composition according to claim 1 , wherein the host liquid crystal A comprises one or more compounds of general formula M:

in which,
R M1 and R M2 each independently represents a C 1-12 linear or branched alkyl,

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

wherein one or more —CH 2 — in

Assignees

• Jiangsu Hecheng Display Tech

Inventors

• Ma Wenyang
• Wang Liwei
• Yan Weigang
• Han Wenming
• Xu Haibin

Classifications

• C09K19/54

  Additives having no specific mesophase {characterised by their chemical composition} · CPC title

• C09K19/42 Primary

  Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 · CPC title

• G02F1/1334

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K2019/548

  stabilizing the alignment; Polymer stabilized alignment · CPC title