Liquid Crystal Composition and Liquid Crystal Display Device

• US 20100308266A1
• Filed: 05/17/2010
• Published: 12/09/2010
• Est. Priority Date: 06/08/2009
• Status: Active Grant

• Current Assignee: JNC Petrochemical Corporation (Chisso Corporation)
• Original Assignee: Chisso Corporation, Chisso Petrochemical Corporation
• Inventors: HIRAOKA, Takashi, YANAI, Takayoshi, SAITO, Masayuki
• Granted Patent: US 8,071,182 B2
• Time in Patent Office: Days
• US Class Current: 252/299.61
• CPC Class Codes: C09K 19/126 Compounds containing at least one asymmetric carbon atom
• CPC Class Codes: C09K 19/3003 Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
• CPC Class Codes: C09K 19/3402 having oxygen as hetero atom sugars C09K19/0422
• CPC Class Codes: C09K 19/3458 Uncondensed pyrimidines
• CPC Class Codes: C09K 19/44 containing compounds with benzene rings directly linked
• CPC Class Codes: C09K 2019/0466 the linking chain being a -CF2O- chain
• CPC Class Codes: C09K 2019/3422 the heterocyclic ring being a six-membered ring
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition

Abstract

Subject The subject is to provide a liquid crystal composition that satisfies at least one of characteristics such as a high maximum temperature of the nematic phase, a low minimum temperature of the nematic phase, a small viscosity, a large optical anisotropy, a large dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light, a high stability to heat and a short helical pitch, or that is suitably balanced regarding at least two of the characteristics. The subject is also to provide an AM device that has a short response time, a large voltage holding ratio, a large contrast ratio, a long service life, a little light-leak and so forth.

Means for Solving the Subject The invention provides a liquid crystal composition that has the nematic phase, including a specific optically active compound as a first component and a specific four-ring compound having a high maximum temperature of the nematic phase as a second component, and optionally including a specific compound having a high maximum temperature or small viscosity as a third component and a specific compound having a positively large dielectric anisotropy as a fourth component, and provides a liquid crystal display device including this composition.

Claims

1. A liquid crystal composition that has the nematic phase, comprising two components, wherein the first component is at least one optically active compound selected from the group of compounds represented by formula (1), and the second component is at least one compound selected from the group of compounds represented by formula (2):

2. The liquid crystal composition according to claim 1, wherein the sum of the number of carbons in R² and R³ of formula (1) is in the range of 3 to 10.

3. The liquid crystal composition according to claim 1, wherein the first component is at least one compound selected from the group of compounds represented by formula (1-1) to formula (1-3):

4. The liquid crystal composition according to claim 1, wherein the ratio of the first component is in the range of approximately 0.01 part by weight to approximately 5 parts by weight based on 100 parts by weight of the liquid crystal composition excluding the first component.

5. The liquid crystal composition according to claim 1, wherein the second component is at least one compound selected from the group of compounds represented by formula (2-1) to formula (2-4)

6. The liquid crystal composition according to claim 1, wherein the ratio of the second component is in the range of approximately 5% by weight to approximately 30% by weight based on the weight of the liquid crystal composition excluding the first component.

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

8. The liquid crystal composition according to claim 7, wherein the third component is at least one compound selected from the group of compounds represented by formula (3-1) to formula (3-7):

9. The liquid crystal composition according to claim 7, wherein the ratio of the third component is in the range of approximately 5% by weight to approximately 75% by weight based on the weight of the liquid crystal composition excluding the first component.

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

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

12. The liquid crystal composition according to claim 10, wherein the fourth component is at least one compound selected from the group of compounds represented by formula (4-1) to formula (4-37):

13. The liquid crystal composition according to claim 11, wherein the fourth component is at least one compound selected from the group of compounds represented by formula (4-1) to formula (4-37) :

14. The liquid crystal composition according to claim 10, wherein the ratio of the fourth component is in the range of approximately 20% by weight to approximately 90% by weight based on the weight of the liquid crystal composition excluding the first component.

15. The liquid crystal composition according to claim 11, wherein the ratio of the fourth component is in the range of approximately 20% by weight to approximately 90% by weight based on the weight of the liquid crystal composition excluding the first component.

16. The liquid crystal composition according to claim 1, wherein the maximum temperature of the nematic phase is approximately 70°

C. or higher, the optical anisotropy (25°

C.) at a wavelength of 589 nm is approximately 0.08 or more, and the dielectric anisotropy (25°

C.) at a frequency of 1 kHz is approximately 2 or more.

17. A liquid crystal display device comprising the liquid crystal composition according to claim 1.

18. The liquid crystal display device according to claim 17, wherein an operating mode of the liquid crystal display device is a TN mode, an OCB mode, an IPS mode or a PSA mode, and a driving mode of the liquid crystal display device is an active matrix mode.