Liquid crystal composition and liquid crystal display device

Patent metadata

Field	Value
Publication number	US-2016208169-A1
Application number	US-201414912606-A
Country	US
Kind code	A1
Filing date	Jun 19, 2014
Priority date	Aug 28, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

To provide a liquid crystal composition satisfying at least one of characteristics or having a suitable balance regarding at least two of the characteristics such as a high maximum temperature of a nematic phase, a low minimum temperature of the nematic phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, large specific resistance, and high stability to ultraviolet light and heat; and an AM device having a short response time, a large voltage holding ratio, a large contrast ratio, a long service life and so forth.
The liquid crystal composition has the nematic phase, and contains a specific compound having large dielectric anisotropy as a first component and a specific compound having small viscosity as a second component, and may contain a specific compound having a high maximum temperature or small viscosity as a third component, and a specific compound having large dielectric anisotropy as a fourth component, and a liquid crystal display device includes the composition.

First claim

1 . A liquid crystal composition that has a nematic phase, and contains at least one compound selected from the group of compounds represented by formula (1) as a first component, and at least one compound selected from the group of compounds represented by formula (2) as a second component:

wherein, in formulas (1) and (2), 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 alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or 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 A and ring B are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, 2, 6-difluoro-1,4-phenylene, pyrimidine-2, 5-diyl, 1,3-dioxane-2,5-diyl or tetrahydropyran-2,5-diyl; Z 1 and Z 2 are independently a single bond, ethylene, vinylene, methyleneoxy, carbonyloxy or difluoromethyleneoxy; X 1 and X 2 are independently hydrogen or fluorine; Y 1 is fluorine, chlorine, alkyl having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, alkoxy having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, or alkenyloxy having 2 to 12 carbons in which at least one of hydrogen is replaced by halogen; m is an integer from 1 to 12; j is 1, 2, 3 or 4; k is 0, 1, 2 or 3; and a sum of j and k is 4 or less.

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

wherein, in formulas (1-1) to (1-14), R 1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , X 10 , X 11 , X 12 , X 13 and X 14 are independently hydrogen or fluorine; and Y 1 is fluorine, chlorine, alkyl having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, alkoxy having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, or alkenyloxy having 2 to 12 carbons in which at least one of hydrogen is replaced by halogen.

3 . The liquid crystal composition according to claim 1 , wherein a ratio of the first component is in the range of 5% by weight to 55% by weight, and a ratio of the second component is in the range of 5% by weight to 50% by weight based on the weight of the liquid crystal composition.

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

wherein, in formula (3), R 3 and R 4 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 C and ring D are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene or 2,5-difluoro-1,4-phenylene; Z 3 is a single bond, ethylene or carbonyloxy; and n is 1, 2 or 3.

5 . The liquid crystal composition according to claim 4 , containing at least one compound selected from the group of compounds represented by formulas (3-1) to (3-13) as the third component:

wherein, in formulas (3-1) to (3-13), R 3 and R 4 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which at least one of hydrogen is replaced by fluorine.

6 . The liquid crystal composition according to claim 4 , wherein a ratio of the third component is in the range of 10% by weight to 70% by weight based on the weight of the liquid crystal composition.

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

wherein, in formula (4), R 5 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; ring E is 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene, pyrimidine-2, 5-diyl, 1,3-dioxane-2,5-diyl or tetrahydropyran-2,5-diyl; Z 4 is a single bond, ethylene or carbonyloxy; X 15 and X 16 are independently hydrogen or fluorine; Y 2 is fluorine, chlorine, alkyl having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, alkoxy having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, or alkenyloxy having 2 to 12 carbons in which at least one of hydrogen is replaced by halogen; and p is 1, 2, 3 or 4.

8 . The liquid crystal composition according to claim 7 , containing at least one compound selected from the group of compounds represented by formulas (4-1) to (4-16) as the fourth component:

wherein, in formulas (4-1) to (4-16), R 5 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons.

9 . The liquid crystal composition according to claim 7 , wherein a ratio of the fourth component is in the range of 5% by weight to 50% by weight based on the 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 (measured at 25° C.) at a wavelength of 589 nanometers is 0.07 or more, and a dielectric anisotropy (measured at 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, an FFS mode or an FPA mode, and a driving mode in the liquid crystal display device is an active matrix mode.

13 . (canceled)

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

wherein, in formula (4), R 5 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; ring E is 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene, pyrimidine-2, 5-diyl, 1,3-dioxane-2,5-diyl or tetrahydropyran-2,5-diyl; Z 4 is a single bond, ethylene or carbonyloxy; X 15 and X 16 are independently hydrogen or fluorine; Y 2 is fluorine, chlorine, alkyl having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, alkoxy having 1 to 12 carbons in which

Assignees

• Jnc Corp
• Jnc Petrochemical Corp

Inventors

• Saito Masayuki
• Furusato Yoshimasa

Classifications

• C09K19/0208

  Twisted Nematic (T.N.); Super Twisted Nematic (S.T.N.); Optical Mode Interference (O.M.I.) · CPC title

• C09K2019/3021

  Cy-Ph-Ph-Cy · CPC title

• C09K2019/3078

  Cy-Cy-COO-Ph-Cy · CPC title

• C09K2019/3071

  Cy-Cy-COO-Cy · CPC title

• C09K2019/3004

  Cy-Cy · CPC title