Liquid crystal display with alignment film of polyphenylenphthalamide-based material and method for fabricating the same

1. A liquid crystal display device, comprising:

a first substrate and a second substrate;

a liquid crystal layer between the first and second substrates; and

an alignment film made of polyphenylenephthalamide based material on at least one of the first and second substrates, wherein the polyphenylenephthalamide based material is a product of a phenylenediamine based material reacted with phthaloyl chloride based material, wherein the phthaloyl chloride based material is characterized by the formula,

wherein X 2 is at least one selected from the group consisting of F, Cl, CN, CF 3 , OCF 3 , C n H 2n+1 , and OC n H 2n+1 , where n is a number between 1 and 10.

2. The liquid crystal display device of claim 1 , wherein the phenylenediamine based material comprises at least one isomer configuration selected from the group consisting of 1,3- and 1,4-isomer configurations, wherein a ratio of 1,4- to 1,3-isomers ranges between 0% and 100%.

3. The liquid crystal display device of claim 2 , wherein the phenylenediamine based material comprises at least one substituent selected from the group consisting of H, F, Cl, CN, CF 3 , OCF 3 , C n H 2n+1 , and OC n H 2n+1 , where n is a number between 1 and 10.

4. The liquid crystal display device of claim 1 , wherein the phthaloyl chloride based material comprises at least one isomer configuration selected from the group consisting of 1,3- and 1,4-isomer configurations, wherein a ratio of 1,4- to 1,3-isomers ranges between 0% and 100%.

5. The liquid crystal display device of claim 4 , wherein the phthaloyl chloride based material comprises at least one substituent selected from the group consisting of F, Cl, CN, CF 3 , OCF 3 , C n H 2n+1 , OC n H 2n+1 , where n is a number between 1 and 10.

6. The liquid crystal display device of claim 1 , wherein the phthaloyl chloride based material is obtained from a phthalic acid based material.

7. The liquid crystal display device of claim 1 , wherein the phthaloyl chloride based material comprises at least one material selected from a group consisting of tetraphthaloyl chloride, 5-methoxyisophthaloyl chloride, 4-methoxyisophthaloyl chloride, 5-methylisophthaloyl chloride, 5-chloroisophthaloyl chloride, 5-fluoroisophthaloyl chloride, 4,5-difluoroisophthaloyl chloride, 5-propoxyisophthaloyl chloride, 5-pentoxyisophthaloyl chloride, 4-methly-5-methoxyisophthaloyl chloride, 5-heptyloxyisophthaloyl chloride, 2-methoxyisophthaloyl chloride, 5-nonyloxyisophthaloyl chloride, 5-fluoroterephthaloyl chloride, and 2-methylterephthaloyl chloride.

8. The liquid crystal display device of claim 1 , wherein the polyphenylenephthalamide based material comprises at least one polymer selected from the group consisting of poly[N,N′-(1,3-phenylene)-5-isophth-alamide], poly[N,N′-(1,4-phenylene)isophthalamide], and poly[N,N′-(1,3-phenylene)terephthalamide].

9. A liquid crystal display device comprising:

a first substrate and a second substrate;

a liquid crystal layer between the first and second substrates; and

an alignment film of the following formula on at least one of the substrates,

wherein substituent X 1 is selected from the group consisting of H, F, Cl, CN, CF 3 , OCF 3 , C n H 2n+1 , and OC n H 2n+1 , substituent X 2 is selected from the group consisting of F, Cl, CN, CF 3 , C n H 2n+1 , and OC n H 2n+1 , where n is a number between 1 and 10 and m is about 50 to 500.

10. The liquid crystal display device of claim 9 , wherein the alignment film further comprises:

phenylenediamine based material; and

phthalic acid based material,

wherein each of the phenylenediamine based material and phthalic acid based material comprise at least one isomer configuration selected from the group consisting of 1,3- and 1,4-isomer configurations, wherein a ratio of 1,4- to 1,3-isomers ranges between 0% and 100%.

11. A method for fabricating a liquid crystal display device, comprising:

preparing a first substrate and a second substrate;

forming an alignment film having a polyphenylenephthalamide based material on at least one of the substrates, wherein the polyphenylenephthalamide based material is a product of a phenylenediamine based material reacted with phthaloyl chloride based material, the phthaloyl chloride based material characterized by the formula,

wherein X 2 is at least one selected from the group consisting of F, Cl, CN, CF 3 , OCF 3 , C n H 2n+1 , and OC n H 2n+1 , where n is a number between 1 and 10;

irradiating the alignment film with UV light; and

forming a liquid crystal layer between the first and second substrates.

12. The method of claim 11 , wherein the preparing a first substrate comprises:

forming a thin film transistor on the first substrate; and

forming a pixel electrode on the first substrate.

13. The method of claim 11 , wherein the preparing a second substrate comprises:

forming a black matrix on the second substrate; and

forming a color filter layer on the second substrate.

14. The method of claim 11 , further comprising irradiating the alignment film with the light at least one time.

15. The method of claim 11 , further comprising controlling an alignment direction and a pretilt angle of the liquid crystal layer with the light.

16. The method of claim 11 , wherein forming the alignment film comprises reacting a phenylenediamine based material with a phthaloyl chloride based material.

17. The method of claim 16 , further comprising obtaining the phthaloyl chloride based material from a phthalic acid based material.

18. The method of claim 17 , wherein each of the phenylenediamine based material and phthalic acid based material comprise at least one isomer configuration selected from the group consisting of 1,3- and 1,4-isomer configurations, wherein a ratio of 1,4- to 1,3-isomers ranges between 0% and 100%.