Composition for optical film, and films and display device

Patent metadata

Field	Value
Publication number	US-9599760-B2
Application number	US-201514806082-A
Country	US
Kind code	B2
Filing date	Jul 22, 2015
Priority date	Dec 26, 2014
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A composition for an optical film, including a first liquid crystal compound represented by the following Chemical Formula 1 and a second liquid crystal compound represented by the following Chemical Formula 2, wherein a difference between a solubility parameter of the first liquid crystal compound and a solubility parameter of the second liquid crystal compound is about 2.50 to about 2.90

wherein in Chemical Formulae 1 and 2, X, R 1 to R 3 , Z, n, m, and p are the same as described in the detailed description.

First claim

What is claimed is:

1. A composition for an optical film, comprising:
a first liquid crystal compound represented by Chemical Formula 1 and a second liquid crystal compound represented by Chemical Formula 2,
wherein a difference between a solubility parameter of the first liquid crystal compound and a solubility parameter of the second liquid crystal compound is about 2.50 to about 2.90:

wherein, in Chemical Formula 1 or 2,
X is a hydrogen-bonding functional group,
R 1 to R 3 are independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a halogen atom, a substituted or unsubstituted C1 to C10 halogen-containing group, or a combination thereof,
Z is a single bond, —C(═O)O—, —(O═C)O—, or —O(C═)O—,
n is 4 to 8,
m is 0 or 1, and
p is 3 to 6.

2. The composition for an optical film of claim 1 , wherein the X of Chemical Formula 1 is a cyano group, a substituted or unsubstituted C1 to C10 cyano-containing group, a hydroxy group, substituted or unsubstituted C1 to C10 hydroxy-containing group, a carboxyl group, a substituted or unsubstituted C1 to C10 carboxyl-containing group, or a combination thereof.

3. The composition for an optical film of claim 1 , wherein the first liquid crystal compound is represented by Chemical Formula 1a and the second liquid crystal compound is represented by Chemical Formula 2a:

wherein, in Chemical Formula 1a or 2a,
X is a cyano group, a substituted or unsubstituted C1 to C10 cyano-containing group, a hydroxy group, substituted or unsubstituted C1 to C10 hydroxy-containing group, a carboxyl group, a substituted or unsubstituted C1-C10 carboxyl-containing group, or a combination thereof,
n is 4 to 8, and
p is 3 to 6.

4. The composition for an optical film of claim 3 , wherein the first liquid crystal compound is represented by Chemical Formula 1aa and the second liquid crystal compound is represented by one of Chemical Formulae 2aa to 2ad:

5. The composition for an optical film of claim 1 , further comprising a solvent,
wherein an amount of the first liquid crystal compound and the second liquid crystal compound in the composition is about 5 to about 50 percent by weight based on the total weight of the composition, and the remaining amount is the solvent.

6. The composition for an optical film of claim 5 , wherein a mole ratio of the first liquid crystal compound and the second liquid crystal compound is about 1:0.7 to about 1:2.

7. The composition for an optical film of claim 1 , further comprising a photoinitiator.

8. The composition for an optical film of claim 7 , wherein an amount of the photoinitiator is about 0.1 to about 2 percent by weight based on the total amount of the composition.

9. An optical film comprising
a substrate, and
a liquid crystal layer positioned on the substrate,
wherein the liquid crystal layer comprises a first liquid crystal compound represented by Chemical Formula 1 and a second liquid crystal compound represented by Chemical Formula 2, and
wherein a difference between a solubility parameter of the first liquid crystal compound and a solubility parameter of the second liquid crystal compound is about 2.50 to about 2.90:

wherein, in Chemical Formula 1 or 2,
X is a hydrogen-bonding functional group,
R 1 to R 3 are independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a halogen atom, a substituted or unsubstituted C1 to C10 halogen-containing group, or a combination thereof,
Z is a single bond, —C(═O)O—, —(O═C)O— or —O(C═O)—,
n is 4 to 8,
M is 0 or 1, and
p is 3 to 6.

10. The optical film of claim 9 , wherein the X of Chemical Formula 1 comprises a cyano group, a substituted or unsubstituted C1 to C10 cyano-containing group, a hydroxy group, a substituted or unsubstituted C1 to C10 hydroxy-containing group, a carboxyl group, a substituted or unsubstituted C1 to C10 carboxyl-containing group, or a combination thereof.

11. The optical film of claim 9 , wherein the first liquid crystal compound is represented by Chemical Formula 1a and the second liquid crystal compound is represented by Chemical Formula 2a:

wherein, in Chemical Formula 1a or 2a,
X is a cyano group, a substituted or unsubstituted C1 to C10 cyano-containing group, a hydroxy group, a substituted or unsubstituted C1 to C10 hydroxy-containing group, a carboxyl group, a substituted or unsubstituted C1-C10 carboxyl-containing group, or a combination thereof,
n is 4 to 8, and
p is 3 to 6.

12. The optical film of claim 11 , wherein the first liquid crystal compound is represented by Chemical Formula 1aa and the second liquid crystal compound is represented by one of Chemical Formulae 2aa to 2ad:

13. The optical film of claim 9 , wherein the first liquid crystal compound and the second liquid crystal compound are aligned in a direction perpendicular to the length direction of the substrate.

14. The optical film of claim 9 , wherein the liquid crystal layer has in-plane retardation R 0 of 0 nanometers≦R 0 ≦1 nanometer for incident light of about 550 nanometers wavelength.

15. The optical film of claim 14 , wherein the liquid crystal layer has thickness direction retardation R th of 50 nanometers≦R th ≦500 nanometers for incident light of about 550 nanometers wavelength.

16. The optical film of claim 9 , wherein the liquid crystal has a refractive index satisfying Relationship Equation 1:
n z >n x =n y   Relationship Equation 1

wherein, in Relationship Equation 1,
n x is a refractive index of the liquid crystal at a slow axis,
n y is a refractive index of the liquid crystal at a fast axis, and
n z is a refractive index in a direction perpendicular to n x and n y .

17. A compensation film comprising:
the optical film of claim 9 , and
a retardation film positioned on at least one side of the optical film.

18. The compensation film of claim 17 , wherein the retardation film comprises a λ/4 retardation film, a λ/2 retardation film, or a combination thereof.

19. An anti-reflective film, comprising:
the compensation film of claim 17 , and
a polarizer positioned on the compensation film.

20. A display device comprising a display panel and the optical film of claim 9 .

21. A display device comprising a display panel and the compensation film of claim 17 .

22. A display device comprising a display panel and the anti-reflective film of claim 19 .

Assignees

• Samsung Electronics Co Ltd
• Samsung Electronics Co Ltd

Inventors

• Yoo Joungeun
• Park Sang Ho
• Kim Tae-Rae
• Kwon Bok Soon
• Park Ki Tae

Classifications

• C09K19/2007

  the chain containing -COO- or -OCO- groups · CPC title

• G02B5/3083

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• G02B5/3016 Primary

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title

• G02B1/11

  Anti-reflection coatings · CPC title

• C09K19/3068

  chain containing -COO- or -OCO- groups · CPC title