Liquid crystal composition and liquid crystal display having the same
View Patent ↗A liquid crystal composition and a liquid crystal display including the liquid crystal composition that includes a first class containing a fluorine-containing liquid crystal compound represented by Formula I (n=1, 2, or 3), and a second class containing at least one neutral liquid crystal compound represented by Formulae III, IV, and V. In Formula I, W 1 and W 2 are each independently selected from the group consisting of —F, —CF 3 , —CF 2 H, —OCF 3 , and —OCF 2 H, the liquid crystal compounds represented by Formulae I, III, IV, and V have R 1 , R 2 , and R 5 to R 10 that are any one of a hydrogen atom, and an alkyl group, an alkoxy group, and an alkenyl group having 1 to 12 carbon atoms as terminal groups, and a first sub-class has a content of 6 wt % or less based on a total content of the first class and the second class, with the proviso that a liquid crystal compound of the first class having n=1 is the first sub-class and a liquid crystal compound of the first class having n=2 or 3 is a second sub-class.
1. A liquid crystal composition comprising:
a first class comprising a fluorine-containing liquid crystal compound represented by Formula I, where (n=1, 2, or 3),
and a second class comprising at least one neutral liquid crystal compound represented by Formulae III, IV, and V:
wherein W 1 and W 2 are independently one selected from the group consisting of —F, —CF 3 , —CF 2 H, —OCF 3 , and —OCF 2 H,
the liquid crystal compounds represented by Formulae I, III, IV, and V have R 1 , R 2 , and R 5 to R 10 that are any one of a hydrogen atom, and an alkyl group, an alkoxy group, and an alkenyl group having C1 to C12 as terminal groups, and
a first sub-class or a second sub-class, the first sub-class has n=1 and a content of about 6 wt % or less based on the total content of the first class and the second class, the second sub-class having n=2 or 3, and
a third sub-class or a fourth sub-class, the fourth sub-class having the alkenyl group in the terminal groups of the second class and having a content of about 7 wt% or less based on the total content of the first class and the second class, and the third sub-class not having the alkenyl group in the terminal groups of the second class.
2. The liquid crystal composition of claim 1 , comprising no fourth sub-class.
3. The liquid crystal composition of claim 1 , comprising no first sub-class.
4. The liquid crystal composition of claim 1 , wherein the first class further contains a fluorine-containing liquid crystal compound represented by Formula II (n=1, 2, or 3)
wherein W 3 , W 4 , and W 5 are each independently selected from —F, —CF 3 , —CF 2 H, —OCF 3 , and —OCF 2 H, and
the liquid crystal compound represented by Formula II has R 3 and R 4 that are any one of a hydrogen atom, and an alkyl group, an alkoxy group, and an alkenyl group having C1 to C12 as terminal groups.
5. The liquid crystal composition of claim 4 , wherein the fluorine-containing liquid crystal compound represented by Formula includes II a fifth sub-class or a sixth subclass, the fifth sub-class has a content of about 8 wt % or less based on the total content of the first class and the second class, and having n=1, the sixth sub-class having n=2 or 3.
6. The liquid crystal composition of claim 5 , comprising no fifth sub-class.
7. The liquid crystal composition of claim 5 , wherein the second sub-class and the sixth sub-class have a content of about 10 to 25 wt % based on the total content of the liquid crystal composition.
8. The liquid crystal composition of claim 1 , wherein the first class and the second class have a content of about 20 to 80 wt % based on the total content of the liquid crystal composition, respectively.
9. A liquid crystal display comprising:
a first substrate;
a second substrate facing the first substrate;
a pair of field generating electrodes formed on at least one of the first substrate and the second substrate; and
a liquid crystal layer interposed between the first substrate and the second substrate,
wherein the liquid crystal layer has a liquid crystal composition, the liquid crystal composition including
a first class comprising a fluorine-containing liquid crystal compound represented by Formula I, where (n=1, 2, or 3),
and a second class comprising at least one neutral liquid crystal compound represented by Formulae III, IV, and V,
wherein, W 1 and W 2 are each independently selected from the group consisting of —F, —CF 3 , —CF 2 H, —OCF 3 , and —OCF 2 H, the liquid crystal compounds represented by Formulae I, III, IV, and V have R 1 , R 2 , and R 5 to R 10 that are any one of a hydrogen atom, and an alkyl group, an alkoxy group, and
an alkenyl group having C1 to C12 as terminal groups, and
a first sub-class or a second sub-class, the first sub-class has n=1 and has a content of about 6 wt % or less based on the total content of the first class and the second class, the second sub-class having n=2 or 3.
a third sub-class or a fourth sub-class, the fourth sub-class having the alkenyl group in the terminal groups of the second class and having a content of about 7 wt % or less based on the total content of the first class and the second class, and the third sub-class not having the alkenyl group in the terminal groups of the second class.
10. The liquid crystal display of claim 9 , comprising no fourth sub-class.
11. The liquid crystal display of claim 9 , comprising no first sub-class.
12. The liquid crystal display of claim 9 , wherein the first class further contains a fluorine-containing liquid crystal compound represented by Formula II (n=1, 2, or 3),
wherein, W 3 , W 4 , and W 5 are each independently selected from of —F, —CF 3 , —CF 2 H, —OCF 3 , and —OCF 2 H, and
the liquid crystal compound represented by Formula II has R 3 and R 4 that are any one of a hydrogen atom, and an alkyl group, an alkoxy group, and an alkenyl group having C1 to C12 as terminal groups.
13. The liquid crystal display of claim 12 , wherein the fluorine-containing liquid crystal compound represented by Formula II includes a fifth sub-class or a sixth class, the fifth class has a content of about 8 wt % or less based on the total content of the first class and the second class and having n=1, the sixth sub-class, having n=2 or 3.
14. The liquid crystal display of claim 13 , comprising no fifth sub-class.
15. The liquid crystal display of claim 13 , wherein the second sub-class and the sixth sub-class have a content of about 10 to 25 wt % based on the total content of the liquid crystal composition.
16. The liquid crystal display of claim 9 , wherein the first class and the second class have a content of about 20 to 80 wt % based on the total content of the liquid crystal composition.
17. The liquid crystal display of claim 9 , further comprising:
an inclination direction determination member determining an inclination direction of the liquid crystal compound in the liquid crystal layer.
18. The liquid crystal display of claim 17 , wherein the inclination direction determination member includes a cutout formed in a field generating electrode or a protrusion formed on the field generating electrode.
19. The liquid crystal composition of claim 5 , wherein the total amount of the first sub-class and the second sub-class is about 8% or less.
20. The liquid crystal display of claim 13 , wherein the total amount of the first sub-class and the second sub-class is about 8% or less.