# US 9,005,479 B2 · Liquid crystal display device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,005,479 B2
- Document ID: US9005479B2
- Status: Granted
- Kind: B2
- Application number: 13/510,004
- Filed: 2010-11-19
- Published: 2012-09-13
- Granted: 2015-04-14
- Earliest claimed: 2009-11-27
- Assignees: Jnc Corporation; Jnc Petrochemical Corporation
- Applicants: Takayoshi Yanai; Masayuki Saito
- Inventors: Takayoshi Yanai; Masayuki Saito
- Web page: https://patentgrep.com/patent/US9005479B2

## CPC

- C09K 19/42: Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K 19/20: linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters {or ethers}
- C09K 19/3066: {in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers}
- C09K 2019/0466: {the linking chain being a -CF2O- chain}
- C09K 2019/122: {Ph-Ph}
- C09K 2019/3004: {Cy-Cy}
- C09K 2019/301: {Cy-Cy-Ph}
- C09K 2019/3016: {Cy-Ph-Ph}
- C09K 2019/3037: {Cy-Cy-C2H4-Ph}
- G02F 1/0045: {Liquid crystals characterised by their physical properties}
- G02F 1/134372: {for fringe field switching [FFS] where the common electrode is not patterned}
- G02F 1/13706: {the liquid crystal having positive dielectric anisotropy}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

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

## Claims

### Claim 1

A liquid crystal display device that has an FFS mode as an operating mode of the liquid crystal display device and an active matrix mode as a driving mode thereof, and contains a liquid crystal composition having a positive dielectric anisotropy, wherein the liquid crystal composition contains at least one compound selected from the group of compounds represented by formula (1) as a first component, at least one compound selected from the group of compounds represented by formula (2) as a second component, and at least one compound selected from the group of compounds represented by formula (3-1) and formula (3-2) as a third component, wherein at least one of the third component is a compound selected from a group of compounds represented by formula (3-2), and a ratio of the first component is 10% by weight or more based on the total weight of the liquid crystal composition:
wherein R1, R2, R3, R4 and R5 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 arbitrary hydrogen is replaced by fluorine; ring A and ring B 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; ring C, ring D and ring E are independently 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 1,4-phenylene, 3-fluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene or 2,5-pyrimidine; Z1 is independently a single bond, ethylene or carbonyloxy; Z2, Z3 and Z4 are independently a single bond, ethylene, carbonyloxy or difluoromethyleneoxy; Z5 is difluoromethyleneoxy; X1, X2, X3 and X4 are independently hydrogen or fluorine; Y1 is fluorine or trifluoromethoxy; Y2 is fluorine, chlorine or trifluoromethoxy; m is 1, 2 or 3; and n is 1 or 2.

### Claim 2 (depends on 1)

The liquid crystal display device according to claim 1, wherein the first component of the liquid crystal composition is at least one compound selected from the group of compounds represented by formula (1-1) and formula (1-2):
wherein R1 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 arbitrary hydrogen is replaced by fluorine.

### Claim 3 (depends on 1)

The liquid crystal display device according to claim 1, wherein the second component of the liquid crystal composition is at least one compound selected from the group of compounds represented by formula (2-1) to formula (2-13):
wherein R2 and R3 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 arbitrary hydrogen is replaced by fluorine.

### Claim 4 (depends on 1)

The liquid crystal display device according to claim 1, wherein a ratio of the first component of the liquid crystal composition is in the range of 10% by weight to 50% by weight and a ratio of the second component thereof is in the range of 20% by weight to 90% by weight based on the total weight of the liquid crystal composition.

### Claim 5 (depends on 1)

The liquid crystal display device according to claim 1, wherein the third component of the liquid crystal composition is at least one compound selected from the group of compounds represented by formula (3-1-1) to formula (3-1-29), and formula (3-2-6) to formula (3-2-8):
wherein R4 and R5 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 arbitrary hydrogen is replaced by fluorine.

### Claim 6 (depends on 1)

The liquid crystal display device according to claim 1, wherein a ratio of the third component of the liquid crystal composition is in the range of 15% by weight to 60% by weight based on the total weight of the liquid crystal composition.

### Claim 7 (depends on 1)

The liquid crystal display device according to claim 1, wherein the liquid crystal composition further contains at least one compound selected from the group of compounds represented by formula (4) as a fourth component:
wherein R6 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 arbitrary hydrogen is replaced by fluorine; ring F, ring G, ring H and ring I are independently 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene, tetrahydropyran-2,5-diyl or 2,5-pyrimidine; Z6, Z7, Z8 and Z9 are independently a single bond, ethylene, carbonyloxy or difluoromethyleneoxy; X5 and X6 are independently hydrogen or fluorine; and Y3 is fluorine, chlorine or trifluoromethoxy.

### Claim 8 (depends on 7)

The liquid crystal display device according to claim 7, wherein the fourth component of the liquid crystal composition is at least one compound selected from the group of compounds represented by formula (4-1) to formula (4-5):
wherein R6 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 arbitrary hydrogen is replaced by fluorine; X5, X6, X7, X8, X9, X10, X11, X12 and X13 are independently hydrogen or fluorine; and Y3 is fluorine, chlorine or trifluoromethoxy.

### Claim 9 (depends on 7)

The liquid crystal display device according to claim 7, wherein a ratio of the fourth component of the liquid crystal composition is in the range of 3% by weight to 20% by weight based on the total weight of the liquid crystal composition.

### Claim 10 (depends on 1)

A liquid crystal composition, contained in the liquid crystal display device according to claim 1.

### Claim 11 (depends on 10)

The liquid crystal composition according to claim 10, 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 10 or more.