Coating solution composition of photo-alignment material
View Patent ↗There is provided a coating solution composition of a photo-alignment material. The coating solution composition of the photo-alignment material, adaptive for a photo-alignment process, employs a imidazolidinone-based solvent instead of a typical NMP-based solvent. In a coating method, the photo-alignment material is coated on a substrate in a state that its structure is stabilized in the coating solution through optimization of the coating solution composition. Accordingly, the photoreaction yield increases and a reaction product is stabilized so that a twist angle and a pretilt angle can be improved.
1. A coating solution composition for a liquid crystal alignment process, the composition comprising an imidazolidinone-based solvent,
wherein the imidazolidinone-based solvent comprises an imidazolidinone, a butyl cellosolve and a butyl cellosolve acetate,
wherein a ratio of the imidazolinone to the butyl cellosolve or the butyl cellosolve acetate is about 3:7 to about 5:5.
2. The coating solution composition according to claim 1 , wherein the imidazolidinone is selected from a group consisting of 1,3Dimethyl-2-Imidazolidinone (DMI), Dipropylimidazolidinone (DPI), or Diethylimidazolidinone (DEI).
3. The coating solution composition according to claim 1 , wherein the imidazolidinone-based solvent further comprises a γ-butyrolatone.
4. A coating solution composition for a photo-alignment material adapted for use in a photo-alignment process, the composition comprising a imidazolidinone-based solvent,
wherein the imidazolidinone-based solvent comprises a mixture of an imidazolidinone and a butyl cellosolve.
5. The coating solution composition according to claim 4 , wherein the imidazolidinone-based solvent further comprises a γ-butyrolatone, and a butyl cellosolve acetate.
6. The coating solution composition according to claim 4 , wherein the imidazolidinone-based solvent further comprises a butyl cellosolve acetate.
7. The coating solution composition according to claim 1 further comprising a liquid crystal alignment agent configured to align in a predetermined direction with respect to a polarization direction of a linearly polarized UV light.
8. The coating solution composition according to claim 4 further comprising a liquid crystal alignment agent configured to align in a predetermined direction with respect to a polarization direction of a linearly polarized UV light.
9. A method of applying a liquid crystal on a substrate comprising forming a photo-alignment material on the substrate using a coating solution composition comprising an imidazolidinone-based solvent,
wherein the imidazolidinone-based solvent comprises a mixture of an imidazolidinone and a butyl cellosolve.
10. The method of according to claim 9 , wherein the coating solution composition further comprises, a γ-butyrolatone and a butyl cellosolve acetate.
11. The method of according to claim 9 , wherein the coating solution composition further comprises a butyl cellosolve acetate.
12. The method of according to claim 10 , wherein the coating solution composition comprises a ratio of the imidazolidinone to one of the butyl cellosolve, the butyl cellosolve acetate or the γ-butyrolatone of about 3:7 to about 5:5.
13. The method of according to claim 9 , wherein the coating solution composition further comprises a liquid crystal alignment agent configured to align in a predetermined direction with respect to a polarization direction of a linearly polarized UV light.
14. The coating solution composition according to claim 9 , wherein the imidazolidinon is selected from a group consisting of 1,3Dimethyl-2-Imidazolidinone (DMI), Dipropylimidazolidinone(DPI), or Diethylimidazolidinone (DEI).
15. A method for fabricating an LCD including first and second substrates having an alignment layer on the first and second substrates, and a liquid crystal layer interposed between the first and second substrates, the method comprising using a coating solution composition in an alignment material and adapted for use in an alignment process, wherein the coating solution composition comprises an imidazolidinone-based solvent,
wherein the imidazolidinone-based solvent comprises a mixture of an imidazolidinone and a butyl cellosolve.
16. The method according to claim 15 , wherein the imidazolidinone-based solvent further comprises a butyl cellosolve acetate and a γ-butyrolatone.
17. The method according to claim 15 , wherein the imidazolidinone-based solvent further comprises a butyl cellosolve acetate.
18. The method according to claim 15 , wherein the imidazolidinone-based solvent further comprises γ-butyrolatone.
19. The method according to claim 15 , further comprising:
attaching the first and second substrates together; and
injecting liquid crystal into a space between the attached first and second substrates to form a liquid crystal layer.
20. The method according to claim 15 , further comprising:
dispensing liquid crystal on one of the first and second substrates; and
attaching the first and second substrates together.
21. The method according to claim 15 , further comprising:
forming a black matrix on the second substrate;
forming a color filter layer on the black matrix;
forming an overcoat layer on the color filter layer; and
forming the alignment layer on the overcoat layer.
22. The method according to claim 15 , further comprising:
forming gate and common lines on the first substrate in a horizontal direction such that the gate and common lines are spaced apart from each other by a predetermined distance;
forming a data line in a direction crossing the gate line;
forming a plurality of common electrodes substantially parallel to the data line; and
forming a plurality of pixel electrodes alternating with the common electrodes.
23. The method according to claim 15 , wherein the alignment layer includes an organic material having UV reactor as a solute of the coating solution.
24. The method according to claim 15 , wherein the imidazolidinone is selected from a group consisting of 1,3Dimethyl-2-Imidazolidinone (DMI), Dipropylimidazolidinone (DPI), or Diethylimidazolidinone (DEI).
25. The method according to claim 15 , wherein the alignment treatment process comprises a rubbing method.
26. The method according to claim 15 , wherein the alignment treatment process comprises a light irradiation method.
27. The method according to claim 15 , wherein the light comprises a polarized UV light or non-polarized UV or partially polarized UV.