Vertical alignment layer including a polyimide and liquid crystal display including the same

1. An alignment layer comprising a polyimide,

wherein the polyimide is derived from a composition comprising:

a dianhydride-based compound; and

a compound represented by Chemical Formula 1:

wherein X 1 and X 2 each independently comprise F, CI, or CN, and wherein R 1 comprises at least one of a substituted or non-substituted C 1 -C 12 alkyl group, a substituted or non-substituted C 1 -C 12 alkoxy group, a substituted or non-substituted C 1 -C 12 halogen-containing alkyl group, and a substituted or non-substituted C 1 -C 12 halogen-containing alkoxy group.

2. The alignment layer of claim 1 , wherein an imidization ratio of the alignment layer is greater than 70%.

3. The alignment layer of claim 1 , wherein composition comprises 40 mol % to 60 mol % of the dianhydride-based compound.

4. The alignment layer of claim 3 , wherein the composition comprises 10 mol % to 20 mol% of the compound represented by Chemical Formula 1.

5. The alignment layer of claim 4 , wherein the composition further comprises a compound represented by Chemical Formula 2:

wherein Y comprises an oxygen atom, a carbonyl group, a carboxyl group, an amide group, a substituted or non-substituted C 2 -C 12 alkylene group, or a substituted or non-substituted C 2 -C 12 phenylene group, and wherein R 2 comprises at least one of a substituted or non-substituted C 1 -C 12 alkyl group, a substituted or non-substituted C 1 -C 12 alkoxy group, a substituted or non-substituted C 1 -C 12 halogen-containing alkyl group, and a substituted or non-substituted C 1 -C 12 halogen-containing alkoxy group.

6. The alignment layer of claim 5 , wherein the composition comprises 25 mol % to 45 mol % of the compound represented by Chemical Formula 2.

7. The alignment layer of claim 1 , wherein the composition comprises 10 mol % to 20 mol % of the compound represented by Chemical Formula 1.

8. The alignment layer of claim 7 , wherein the imidization ratio of the alignment layer is greater than 70%.

9. The alignment layer of claim 1 , wherein the dianhydride-based compound comprises a compound represented by at least one of Chemical Formula 3, and Chemical Formula 4:

10. A liquid crystal display, comprising:

a first substrate;

a second substrate facing the first substrate;

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

an alignment layer disposed between the first substrate and the second substrate,

wherein the alignment layer comprises a polyimide derived from a composition comprising:

a dianhydride-based compound; and

a compound represented by Chemical Formula 1:

wherein X 1 and X 2 each independently comprise F, CI, or CN, and wherein R 1 comprises at least one of a substituted or non-substituted C 1 -C 12 alkyl group, a substituted or non-substituted C 1 -C 12 alkoxy group, a substituted or non-substituted C 1 -C 12 halogen-containing alkyl group, and a substituted or non-substituted C 1 -C 12 halogen-containing alkoxy group.

11. The liquid crystal display of claim 10 , further comprising:

a gate line disposed on the first substrate;

a first data line disposed on the first substrate;

a second data line disposed on the first substrate;

a first thin film transistor connected to the gate line and the first data line;

a second thin film transistor connected to the gate line and the second data line;

a first sub-pixel electrode connected to the first thin film transistor; and

a second sub-pixel electrode connected to the second thin film transistor.

12. The liquid crystal display of claim 11 , wherein the first sub-pixel electrode and the second sub-pixel electrode each comprise a main branch and a plurality of sub-branches connected to the main branch, the plurality of sub-branches comprising a pectinated pattern.

13. The liquid crystal display of claim 12 , wherein an imidization ratio of the alignment layer is greater than 70%.

14. The liquid crystal display of claim 12 , wherein the composition comprises 40 mol % to 60 mol % of the dianhydride-based compound.

15. The liquid crystal display of claim 14 , wherein the composition comprises 10 mol % to 20 mol % of the compound represented by Chemical Formula 1.

16. The liquid crystal display of claim 15 , wherein the composition further comprises a compound represented by Chemical Formula 2:

wherein Y comprises an oxygen atom, a carbonyl group, a carboxyl group, an amide group, a substituted or non-substituted C 2 -C 12 alkylene group, or a substituted or non-substituted C 2 -C 12 phenylene group, and wherein R 2 comprises at least one of a substituted or non-substituted C 1 -C 12 alkyl group, a substituted or non-substituted C 1 -C 12 alkoxy group, a substituted or non-substituted C 1 -C 12 halogen-containing alkyl group, and a substituted or non-substituted C 1 -C 12 halogen-containing alkoxy group.

17. The liquid crystal display of claim 16 , wherein the composition comprises 25 mol % to 45 mol % of the compound represented by Chemical Formula 2.

18. The liquid crystal display of claim 11 , wherein the first sub-pixel electrode and the second sub-pixel electrode each comprise an inclination direction determining member, and wherein the inclination direction determining member comprises a cutout.

19. The liquid crystal display of claim 18 , wherein the imidization ratio of the alignment layer is greater than 70%.

20. The liquid crystal display of claim 18 , wherein the composition comprises 40 mol % to 60 mol % of the dianhydride-based compound.