Liquid crystal composition and liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9499745-B2
Application number	US-201314647827-A
Country	US
Kind code	B2
Filing date	Nov 26, 2013
Priority date	Dec 4, 2012
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A liquid crystal composition contains a specific compound having large dielectric anisotropy as a first component and a specific bicyclic compound having small viscosity as a second component, and may contain a specific compound having high maximum temperature or large dielectric anisotropy as a third component and a specific compound having high maximum temperature or small viscosity as a fourth component, and has a nematic phase. The liquid crystal display device includes the composition.

First claim

What is claimed is:

1. A liquid crystal composition that has a positive dielectric anisotropy and contains at least one compound represented by formula (1) as a first component and at least one compound represented by formula (2) as a second component:

wherein, R 1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; R 2 is propyl; R 3 is hydrogen; X 1 , X 2 , X 3 and X 4 are independently hydrogen or fluorine; and Y 1 is fluorine, chlorine, trifluoromethyl or trifluoromethoxy.

2. The liquid crystal composition according to claim 1 , containing at least one compound selected from the group of compounds represented by formula (1-1) to formula (1-18) as the first component:

wherein, R 1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons.

3. The liquid crystal composition according to claim 1 , wherein a ratio of the first component is in the range of 3% by weight to 35% by weight and a ratio of the second component is in the range of 5% by weight to 65% by weight, based on the total weight of a liquid crystal composition.

4. The liquid crystal composition according to claim 1 , containing at least one compound selected from the group of compounds represented by formula (3-1) and formula (3-2) as a third component:

wherein, R 4 and R 5 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; ring A, ring B and ring C are independently 1,4-cyclohexylene, 1,4-phenylene, 3-fluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene, tetrahydropyran-2,5-diyl or pyrimidine-2,5-diyl; Z 1 , Z 2 and Z 3 are independently a single bond, ethylene, carbonyloxy or difluoromethyleneoxy; X 5 , X 6 , X 7 and X 8 are independently hydrogen or fluorine; Y 2 and Y 3 are independently fluorine, chlorine, trifluoromethyl or trifluoromethoxy; m is 1, 2 or 3; n and p are independently 0, 1 or 2, and a sum of n and p is 3 or less; and when n is 0, p is 1 and Z 3 is a single bond, ring C is 1,4-cyclohexylene, tetrahydropyran-2,5-diyl or pyrimidine-2,5-diyl.

5. The liquid crystal composition according to claim 1 , containing at least one compound selected from the group of compounds represented by formula (3-1-1) to formula (3-1-16) and formula (3-2-1) to formula (3-2-4) as the third component:

wherein, R 4 and R 5 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; X 5 , X 6 ,X 7 , X 8 , X 9 , X 10 , X 11 , X 12 , X 13 , X 14 , X 15 , X 16 , X 17 , X 18 , X 19 , X 20 , X 21 and X 22 are independently hydrogen or fluorine; and Y 2 and Y 3 are independently fluorine, chlorine, trifluoromethyl or trifluoromethoxy.

6. The liquid crystal composition according to claim 4 , wherein a ratio of the third component is in the range of 5% by weight to 65% by weight based on the total weight of the liquid crystal composition.

7. The liquid crystal composition according to claim 1 , containing at least one compound represented by formula (4) as a fourth component:

wherein, R 6 and R 7 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which at least one of hydrogen is replaced by fluorine; ring D and ring E are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene or 2,5-difluoro-1,4-phenylene; Z 4 is independently a single bond, ethylene or carbonyloxy; q is 1, 2 or 3; and ring E when q is 1 is 1,4-phenylene.

8. The liquid crystal composition according to claim 1 , containing at least one compound selected from the group of compounds represented by formula (4-1) to formula (4-13) as the fourth component:

wherein, R 6 and R 7 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which at least one of hydrogen is replaced by fluorine.

9. The liquid crystal composition according to claim 7 , wherein a ratio of the fourth component is in the range of 3% by weight to 45% by weight based on the total weight of the liquid crystal composition.

10. The liquid crystal composition according to claim 1 , wherein a maximum temperature of a nematic phase is 70° C. or higher, an optical anisotropy (25° C.) at a wavelength of 589 nanometers is 0.08 or more, and a dielectric anisotropy (25° C.) at a frequency of 1 kHz is 2 or more.

11. A liquid crystal display device, including the liquid crystal composition according to claim 1 .

12. The liquid crystal display device according to claim 11 , wherein an operating mode in the liquid crystal display device is a TN mode, an ECB mode, an OCB mode, an IPS mode, a PSA mode or an FPA mode, and a driving mode in the liquid crystal display device is an active matrix mode.

13. The liquid crystal composition according to claim 4 , containing at least one compound represented by formula (4) as a fourth component:

wherein, R 6 and R 7 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which at least one of hydrogen is replaced by fluorine; ring D and ring E are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene or 2,5-difluoro-1,4-phenylene; Z 4 is independently a single bond, ethylene or carbonyloxy; q is 1, 2 or 3; and ring E when q is 1 is 1,4-phenylene.

14. The liquid crystal composition according to claim 4 , containing at least one compound selected from the group of compounds represented by formula (4-1) to formula (4-13) as the fourth component:

wherein, R 6 and R 7 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which at least one of hydrogen is replaced by fluorine.

15. The liquid crystal composition according to claim 13 , wherein a ratio of the fourth component is in the range of 3% by weight to 45% by weight based on the total weight of the liquid crystal composition.

Assignees

• Jnc Corp
• Jnc Petrochemical Corp

Inventors

• Yanai Takayoshi
• Hattori Norikatsu
• Maeda Taketo

Classifications

• C09K2019/0466

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

• C09K2019/3004

  Cy-Cy · CPC title

• C09K2019/3016

  Cy-Ph-Ph · CPC title

• C09K19/20

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