Liquid crystal composition and liquid crystal display device including the same

Patent metadata

Field	Value
Publication number	US-9371482-B2
Application number	US-201414227823-A
Country	US
Kind code	B2
Filing date	Mar 27, 2014
Priority date	Sep 12, 2013
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A liquid crystal display device includes a first substrate including at least one electrode configured to form an electric field, a second substrate facing the first substrate, and a liquid crystal layer disposed between the first substrate and the second substrate. The liquid crystal layer includes liquid crystal of negative dielectric anisotropy, an additive, and a derivative of the additive.

First claim

What is claimed is:

1. A liquid crystal display device, comprising:
a first substrate comprising at least one electrode configured to form an electric field;
a second substrate facing the first substrate; and
a liquid crystal layer disposed between the first substrate and the second substrate,
wherein the liquid crystal layer comprises a liquid crystal composition comprising:
a first additive represented by the following Chemical Formula 1:

and

liquid crystals of negative dielectric anisotropy represented by the following Chemical Formula 5:

wherein R and R′ each represents an alkyl group or an alkenyl group having 1 to 5 carbon atoms; and
R and R′ are not both an alkyl group.

2. The liquid crystal display device of claim 1 , wherein:
the at least one electrode comprises a pixel electrode and a common electrode insulated from the pixel electrode; and
respective portions of the common electrode and the pixel electrode overlap one another when viewed in a plan view.

3. The liquid crystal display device of claim 2 , wherein:
the common electrode is a plate-shaped common electrode; and
the pixel electrode comprises a stem part and branch parts extending from the stem part.

4. The liquid crystal display device of claim 2 , wherein:
the pixel electrode is a plate-shaped pixel electrode; and
the common electrode comprises a stem part and branch parts extending from the stem part.

5. The liquid crystal display device of claim 1 , wherein the concentration of the first additive ranges from about 100 ppm to about 1,000 ppm based on a total amount of the liquid crystal composition.

6. The liquid crystal display device of claim 5 , wherein the liquid crystal composition comprises an alkenyl-based liquid crystal.

7. The liquid crystal display device of claim 6 , wherein:
the liquid crystal composition further comprises at least one of the liquid crystals represented by the following Chemical Formula 2:

R and R′ each represent an alkyl group or an alkenyl group having 1 to 5 carbon atoms; and
R and R′ are not both an alkyl group.

8. The liquid crystal display device of claim 7 , wherein:
the liquid crystal composition further comprises at least one of the liquid crystals represented by the following Chemical Formula 3:

R and R′ each represents an alkyl group or an alkenyl group having 1 to 5 carbon atoms; and
R and R′ are not both an alkyl group.

9. The liquid crystal display device of claim 6 , wherein:
the liquid crystal composition further comprises at least one of the liquid crystals represented by the following Chemical Formula 4:

R and R′ each represents an alkyl group or an alkenyl group having 1 to 5 carbon atoms; and
R and R′ are not both an alkyl group.

10. The liquid crystal display device of claim 9 , wherein:
the liquid crystals further comprises at least one of liquid crystals represented by the following:

R and R′ each represents an alkyl group or an alkenyl group having 1 to 5 carbon atoms; and
R and R′ are not both an alkyl group.

11. The liquid crystal display device of claim 6 , wherein:
the liquid crystal composition further comprises a second additive; and
the second additive is a phenolic antioxidant.

12. The liquid crystal display device of claim 11 , wherein:
the second additive is represented by the following Chemical Formula 6:

and
w is 1 to 15.

13. A liquid crystal composition, comprising:
a first additive represented by the following Chemical Formula 1:

and
liquid crystals of negative dielectric anisotropy represented by the following Chemical Formula 5:

wherein R and R′ each represents an alkyl group or an alkenyl group having 1 to 5 carbon atoms; and
R and R′ are not both an alkyl group.

14. The liquid crystal composition of claim 13 , wherein the concentration of the first additive ranges from about 100 ppm to about 1,000 ppm based on a total amount of the liquid crystal composition.

15. The liquid crystal composition of claim 14 , wherein the liquid crystal composition comprises an alkenyl-based liquid crystal.

16. The liquid crystal composition of claim 15 , wherein:
the liquid crystal composition further comprises at least one of the liquid crystals represented by the following Chemical Formula 2:

R and R′ each represent an alkyl group or an alkenyl group having 1 to 5 carbon atoms; and
R and R′ are not both an alkyl group.

17. The liquid crystal composition of claim 16 , wherein:
the liquid crystal composition further comprises at least one of the liquid crystals represented by the following Chemical Formula 3:

R and R′ each represents an alkyl group or an alkenyl group having 1 to 5 carbon atoms; and
R and R′ are not both an alkyl group.

18. The liquid crystal composition of claim 15 , wherein:
the liquid crystal composition further comprises at least one of the liquid crystals represented by the following Chemical Formula 4:

R and R′ each represents an alkyl group or an alkenyl group having 1 to 5 carbon atoms; and
R and R′ are not both an alkyl group.

19. The liquid crystal composition of claim 18 , wherein:
the liquid crystal further comprises at least one of liquid crystals represented by the following:

R and R′ each represents an alkyl group or an alkenyl group having 1 to 5 carbon atoms; and
R and R′ are not both an alkyl group.

20. The liquid crystal composition of claim 15 , wherein:
the liquid crystal composition further comprises a second additive; and
the second additive is a phenolic antioxidant represented by the following Chemical Formula 6:

and
w is 1 to 15.

21. The liquid crystal display device of claim 1 , wherein the liquid crystal composition further comprises a derivative of the first additive represented by Chemical Formula 1.

22. The liquid crystal composition of claim 13 , further compri

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Taeho
• Kim Misuk
• Park Soyoun
• Kim Siheun
• Inoue Daisuke

Classifications

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K2019/3422

  the heterocyclic ring being a six-membered ring · CPC title

• G02F2001/13629

  Physics · mapped topic

• C09K19/54

  Additives having no specific mesophase {characterised by their chemical composition} · CPC title