Liquid crystal display device and liquid crystal composition used therefor

Patent metadata

Field	Value
Publication number	US-9783735-B2
Application number	US-201615059871-A
Country	US
Kind code	B2
Filing date	Mar 3, 2016
Priority date	Apr 15, 2015
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A liquid crystal display device comprises a first substrate, a second substrate which faces the first substrate, an electrode part which is provided on at least one of the first substrate and the second substrate, and a liquid crystal layer which comprises a liquid crystal composition and is provided between the first substrate and the second substrate. The liquid crystal composition includes a liquid crystal compound of Formula 1.

wherein R 1 , R 2 , A 11 , A 12 , A 13 , A 21 , A 22 , Z 11 , Z 12 , Z 13 , Z 21 , Z 22 , a, b, c, d, and e are as described herein.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a first substrate;
a second substrate facing the first substrate;
an electrode part provided on at least one of the first substrate and the second substrate; and
a liquid crystal layer provided between the first substrate and the second substrate, the liquid crystal layer comprising a liquid crystal composition,
wherein the liquid crystal composition comprises at least one liquid crystal compound represented as Formula 1 and at least one liquid crystal compound represented as Formula 2,

wherein R 1 is hydrogen or an alkyl having 1-15 carbon atoms, in which at least one —CH 2 — group may be independently replaced by —C≡C—, —CF 2 O—, —CH═CH—, —O—, —CO—O—, —O—CO— or —O—CO—O— in such a way that no two oxygen atoms bind to each other, and one to three hydrogen atoms may be replaced by halogen atoms,
wherein R 2 is —F, —Cl, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —CN, —NCS, or an alkyl having 1-5 carbon atoms substituted with one to three of —F, and —CH 2 — groups are optionally replaced by O atoms independently of each other, in such a way that no two oxygen atoms bind each other, wherein (F) represents that a hydrogen atom is optionally replaced by —F,
wherein A 11 , A 12 , A 13 , A 21 and A 22 , represent one of the following structures independently of each other:

 and
wherein Z 11 , Z 12 , Z 13 , Z 21 and Z 22 , are each independently a single bond, —CH 2 CH 2 —, —CH═CH—, —CH 2 O—, —OCH 2 —, —C≡C—, —CH 2 CF 2 —, —CHFCHF—, —CF 2 CH 2 —, —CH 2 CHF—, —CHFCH 2 —, —C 2 F 4 —, —COO—, —OCO—, —CF 2 O—, or —OCF 2 — independently of each other; and

a, b, c, d and e, are each independently an integer from 0 to 3, and a+b+c+d+e is less than or equal to 5,

wherein R 11 is the same as in the definition for R 1 in Formula 1, R 21 , in addition to the definition of R 1 in Formula 1, represents —F, —Cl, —CF 3 , or —OCF 3 , A 3 and A 4 are 1,4-cyclohexylene or 1,4-phenylene, independently, and A 5 represents one of the following structures:

2. A liquid crystal composition comprising at least one liquid crystal compound represented as Formula 1 and at least one liquid crystal compound represented by Formula 2,

wherein, R 1 is hydrogen or an alkyl having 1-15 carbon atoms, in which at least one —CH 2 — group may be independently replaced by —C≡C—, —CF 2 O—, —CH═CH—, —O—, —CO—O—, —O—CO— or —O—CO—O— in such a way that no two oxygen atoms bind to each other, and one to three hydrogen atoms may be replaced by halogen atoms,
wherein R 2 is —F, —Cl, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —CN, —NCS, or an alkyl having 1-5 carbon atoms substituted with one to three of —F, and —CH 2 — groups are optionally replaced by O atoms independently of each other, in such a way that no two oxygen atoms bind each other, wherein (F) represents that a hydrogen atom is optionally replaced by —F,
wherein A 11 , A 12 , A 13 , A 21 and A 22 , represent one of the following structures independently of each other:

 and
wherein Z 11 , Z 12 , Z 13 , Z 21 and Z 22 , are each independently a single bond, —CH 2 CH 2 —, —CH═CH—, —CH 2 O—, —OCH 2 —, —C≡C—, —CH 2 CF 2 —, —CHFCHF—, —CF 2 CH 2 —, —CH 2 CHF—, —CHFCH 2 —, —C 2 F 4 —, —COO—, —OCO—, —CF 2 O—, or —OCF 2 —;
a, b, c, d and e, are each independently an integer from 0 to 3, and a+b+c+d+e is less than or equal to 5,

wherein R 11 is the same as in the definition for R 1 in Formula 1, R 21 , in addition to the definition of R 1 in Formula 1, represents —F, —Cl, —CF 3 , or —OCF 3 , A 3 and A 4 are 1,4-cyclohexylene or 1,4-phenylene, independently, and A 5 represents one of the following structures:

3. The liquid crystal composition according to claim 2 , wherein at least one of Z 11 , Z 12 , Z 13 , Z 21 and Z 22 is —CF 2 O—.

4. The liquid crystal composition according to claim 2 , wherein d and e are 0, and R 2 is —F, —OCF 3 or —CF 3 .

5. The liquid crystal composition according to claim 2 , further comprising a liquid crystal compound represented as Formula 2-1 or Formula 2-2,

wherein R 11 , R 21 and A 5 are independently the same as in the definitions for Formula 2, X 1 to X 5 , are —H or —F independently, and at least one of X 3 and X 4 is —F.

6. The liquid crystal composition according to claim 2 , further comprising a liquid crystal compound represented as Formula 3

wherein R 11 and R 12 are independently the same as in the definition of R 1 in Formula 1, and A 3 and A 4 are independently 1,4-cyclohexylene or 1,4-phenylene.

7. The liquid crystal composition according to claim 6 , wherein the liquid crystal compound represented as Formula 3 is represented as Formula 3-1 or Formula 3-2,

wherein R 11 and R 12 are independently the same as in the definition of R 1 in Formula 1.

8. The liquid crystal composition according to claim 2 , further comprising a liquid crystal compound represented as Formula 4

wherein R 1 and R 2 are the same as in the definitions of R 1 and R 2 in Formula 1, A 11 , A 12 , A 13 , Z 11 , Z 12 and Z 13 are also the same as in the definitions of A 11 , A 12 , A 13 , Z 11 , Z 12 , and Z 13 in Formula 1, f, g, and h are each independently an integer of 0 or 1, and f+g+h is 2 or 3.

9. The liquid crystal composition according to claim 2 , further comprising a pitch modifying agent represented as Formula 8,

wherein R 1 is the same in the definition for Formula 1.

10. The liquid crystal composition according to claim 2 , wherein the liquid crystal compound of Formula 1 is represented as Formula 1-2,

and the liquid crystal composition further comprises a liquid crystal compound represented as 3-1-1 and a compound represented as Formula 5

wherein o is an integer of 0 or 1, R 1 and A 11 are the same as in the definitions for Formula 1, p is an integer of 0 or 1.

11. The liquid crystal composition according to claim 10 , wherein the liquid crystal composition comprises 3-35 parts by weight of the liquid crystal compound represented as Formula 1-2, 15-45 parts by weight of

Assignees

• Samsung Display Co Ltd
• Dongjin Semichem Co Ltd

Inventors

• Kim Si Heun
• Shin Beom Soo
• Oh Keun Chan
• Kim Bong Hee
• Seo Young Ho

Classifications

• C09K2019/123

  Ph-Ph-Ph · CPC title

• C09K2019/3004

  Cy-Cy · CPC title

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K2019/3422

  the heterocyclic ring being a six-membered ring · CPC title

• C09K19/20

  linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters {or ethers} · CPC title