Liquid crystalline compound for vertical alignment and a liquid crystalline composition comprising the same

• US 20050199857A1
• Filed: 08/30/2004
• Published: 09/15/2005
• Est. Priority Date: 11/27/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cho, Hyung Soo, Kim, Jong Seob, Lee, Eun Kyung, Jang, Jee Hwan, Jong, Ji Young
• Granted Patent: US 7,279,202 B2
• Time in Patent Office: Days
• US Class Current: 252/299.63
• CPC Class Codes: C09K 19/12 at least two benzene rings directly linked, e.g. biphenyls
• 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 2019/123 Ph-Ph-Ph
• CPC Class Codes: C09K 2019/124 Ph-Ph-Ph-Ph
• CPC Class Codes: C09K 2019/3025 Cy-Ph-Ph-Ph
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition

Abstract

A vertical alignment liquid crystalline compound containing a laterally substituted aromatic cyclic moiety. The liquid crystalline compound has a wide temperature range of the nematic phase, a high optical anisotropy and a high negative dielectric anisotropy. In addition, since the rotation viscosity and the K33/K11 ratio of the liquid crystalline compound are maintained at a low level, the liquid crystalline compound can be effectively used as a liquid crystalline medium having good image quality and a high response speed even when applied to thin liquid crystalline cells.

Claims

1. A liquid crystalline compound represented by Formula 1 below:

2. The liquid crystalline compound according to claim 1, wherein one of X₁ and X₂ is alkyl or alkoxy group, and the other is H or F.

3. The liquid crystalline compound according to claim 1, wherein the liquid crystalline compound is one of compounds represented by Formulae 2 to 7 below:

4. A liquid crystalline composition comprising the liquid crystalline compounds according to claim 1.

5. The liquid crystalline composition according to claim 4, wherein the liquid crystalline compounds are selected from the group consisting of the compounds represented by Formulae 2 to 7 below:

6. The liquid crystalline composition according to claim 4, wherein the liquid crystalline composition has an optical anisotropy of 0.05˜

0.30.

7. The liquid crystalline composition according to claim 4, wherein the liquid crystalline composition has a negative dielectric anisotropy.

8. A liquid crystalline display, comprising:

a pair of electrode substrates; and

a liquid crystalline layer interposed between the two electrode substrates,

wherein the liquid crystalline layer contains the liquid crystalline composition according to claim 4.

9. A liquid crystalline display, comprising:

a pair of electrode substrates; and

a liquid crystalline layer interposed between the two electrode substrates,

wherein the liquid crystalline layer contains the liquid crystalline composition according to claim 5.

10. A liquid crystalline display, comprising:

a pair of electrode substrates; and

a liquid crystalline layer interposed between the two electrode substrates,

wherein the liquid crystalline layer contains the liquid crystalline composition according to claim 6.

11. A liquid crystalline display, comprising:

a pair of electrode substrates; and

a liquid crystalline layer interposed between the two electrode substrates,

wherein the liquid crystalline layer contains the liquid crystalline composition according to claim 7.

12. The liquid crystalline display according to claim 8, wherein the liquid crystalline display is a TFT-LCD or LcoS (Liquid Crystal on Silicon) using the vertical alignment (VA) mode.