DISPLAY DEVICE AND METHOD OF MANUFACTURING THE SAME

• US 20150198847A1
• Filed: 08/13/2014
• Published: 07/16/2015
• Est. Priority Date: 01/10/2014
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: PARK, Joon-Hyung, Oh, Keunchan, Kim, Min-Jae, Kim, Min-Hee, Jeong, Kangseob, Tak, Kyungseon
• Granted Patent: US 9,726,934 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C09K 19/12 at least two benzene rings directly linked, e.g. biphenyls
• CPC Class Codes: C09K 19/3001 Cyclohexane rings
• 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 2019/0448 the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate
• CPC Class Codes: C09K 2019/122 Ph-Ph
• CPC Class Codes: C09K 2019/123 Ph-Ph-Ph
• CPC Class Codes: C09K 2019/124 Ph-Ph-Ph-Ph
• CPC Class Codes: C09K 2019/3004 Cy-Cy
• CPC Class Codes: C09K 2019/301 Cy-Cy-Ph
• CPC Class Codes: C09K 2019/3016 Cy-Ph-Ph
• CPC Class Codes: G02F 1/133723 Polyimide, polyamide-imide
• CPC Class Codes: G02F 1/133726 made of a mesogenic material
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation

Abstract

A display device including a first substrate, a second substrate facing the first substrate, and a liquid crystal layer provided between the first substrate and the second substrate. The liquid crystal layer has a value of rotation viscosity (γl)/bending modulus of elasticity (K33) of about 6.0 to about 6.4 mPa*s/pN.

Claims

1. A display device comprising:

a first substrate;

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 having a value of rotation viscosity (γ

l)/bending modulus of elasticity (K33) of about 6.0 to about 6.4 mPa*s/pN.

2. The display device of claim 1, wherein the liquid crystal layer has a spraying modulus of elasticity (K11) of about 12.0 to about 15.0 pN .

3. The display device of claim 1, wherein the liquid crystal layer has refractive index anisotropy of about 0.106 to about 0.110, at about 30°

C.

4. The display device of claim 1, wherein the liquid crystal layer has dielectric anisotropy of about -3.2 to about-2.8, at about 30°

C.

5. The display device of claim 1, wherein light provided to the liquid crystal layer and light transmitted through the liquid crystal layer have a phase difference of about 310 to about 350 nm.

6. The display device of claim 1, wherein the liquid crystal layer comprises alkenyl-based liquid crystal molecules, alkoxy-based liquid crystal molecules, and quaterphenyl-based liquid crystal molecules.

7. The display device of claim 6, wherein the alkenyl-based liquid crystal molecules comprise compounds represented by following Formula 1 and Formula 2:

8. The display device of claim 7, wherein the display device comprises:

about 25 to about 30 parts by weight of the compound of Formula 1; and

about 8 to about 13 parts by weight of the compound of Formula 2, based on 100 parts by weight of the liquid crystal layer.

9. The display device of claim 1, wherein the alkoxy-based liquid crystal molecules comprise first alkenyl-based liquid crystal molecules comprising compounds represented by following Formula 3 and Formula 4:

10. The display device of claim 9, wherein the display device comprises:

from about 18 to about 23 parts by weight of the compound of Formula 3; and

from about 8 to about 13 parts by weight of the compound of Formula 4, based on 100 parts by weight of the liquid crystal layer.

11. The display device of claim 9, wherein the alkoxy-based liquid crystal molecules comprise second alkenyl-based liquid crystal molecules comprising at least one of the compounds represented by the following Formula 5 and Formula 6:

12. The display device of claim 11, wherein the display device comprises:

from about 15 to about 20 parts by weight of the second alkoxy-based liquid crystal molecules, based on 100 parts by weight of the liquid crystal layer.

13. The display device of claim 1, wherein the quaterphenyl-based liquid crystal molecule comprises a compound of the following Formula 7:

14. The display device of claim 13, wherein the display device comprises about 0.1 to about 1 parts by weight of the compound of Formula 7, based on 100 parts by weight of the liquid crystal layer.

15. The display device of claim 1, further comprising:

a first alignment layer disposed between the first substrate and the liquid crystal layer; and

a second alignment layer disposed between the second substrate and the liquid crystal layer,

wherein, the first and second alignment layers comprise polymerized reactive mesogens.

16. The display device of claim 15, wherein the reactive mesogens comprise a compound represented by following Formula 8:

17. The display device of claim 16, wherein the display device comprises from about 0.4 to about 0.5 parts by weight of the compound of Formula 8, based on 100 parts by weight of the liquid crystal layer.

18. The display device of claim 1, wherein a cell gap between the first substrate and the second substrate is about 3.0 μ

m.

19. A method of manufacturing a display device, the method comprising:

forming a liquid crystal composition comprising alkynyl-based liquid crystal molecules, alkoxy-based liquid crystal molecules, quaterphenyl-based liquid crystal molecules, and a reactive mesogen, between a first substrate and a second substrate; and

forming alignment forming layers on the first substrate and the second substrate by irradiating the liquid crystal composition,

wherein the liquid crystal layer has a value of rotation viscosity (γ

l)/bending modulus of elasticity (K33) of about 6.0 to about 6.4 mPa*s/pN.