Liquid crystal display and manufacturing method thereof
View Patent ↗A liquid crystal display includes a first display panel and a second display panel facing each other; a liquid crystal layer disposed between the first display panel and the second display panel and including pre-tilted liquid crystal molecules and a first compound derived from a reactive mesogen; and an alignment layer positioned between the first display panel and the second display panel, wherein the alignment layer includes a polyimide derived from a composition including a dianhydride-based compound, and a compound represented by the following Chemical Formula 1. In the above Chemical Formula 1, R 1 is a substituted or non-substituted C 1 -C 8 alkyl group, R 2 is a substituted or non-substituted C 8 -C 30 alkyl group, and A 1 is a functional group including a substituted or non-substituted aliphatic ring and a substituted or non-substituted aromatic ring.
1. A liquid crystal display comprising:
a first display panel and a second display panel facing each other;
a liquid crystal layer disposed between the first display panel and the second display panel, the liquid crystal layer comprising a first compound and liquid crystal molecules; and
an alignment layer disposed between the first display panel and the second display panel,
wherein the liquid crystal molecules are pre-tilted,
wherein the first compound is derived from a reactive mesogen, and
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 R 1 is a substituted or non-substituted C 1 -C 8 alkyl group, R 2 is a substituted or non-substituted C 8 -C 30 alkyl group, and A 1 is a functional group comprising a substituted or non-substituted aliphatic ring and a substituted or non-substituted aromatic ring.
2. The liquid crystal display of claim 1 , wherein
the composition further comprises a compound represented by Chemical Formula 2:
wherein B 1 is an oxygen atom, a carbonyl group, or a carboxylic group, and A 2 is a functional group comprising an aliphatic ring.
3. The liquid crystal display of claim 2 , wherein
a ratio of a sum of a number of moles of the compound represented by Chemical Formula 1 and the compound represented Chemical Formula 2 to a number of moles of the dianhydride-based compound is more than about ⅓.
4. The liquid crystal display of claim 2 , wherein
the composition further comprises a compound represented by Chemical Formula 3:
wherein B 2 and B 3 are independently OH, O, or COOH.
5. The liquid crystal display of claim 1 , wherein
the compound represented by Chemical Formula 1 includes a compound represented by the following Chemical Formula 4, a compound represented by the following Chemical Formula 5, or mixtures thereof:
6. The liquid crystal display of claim 1 , wherein
the compound represented by Chemical Formula 1 includes a compound represented by Chemical Formula 6, a compound represented by Chemical Formula 7, a compound represented by Chemical Formula 8, a compound represented by Chemical Formula 9, or mixtures thereof:
7. The liquid crystal display of claim 1 , wherein
the first compound is an oligomer, a polymer, or a mixture thereof.
8. The liquid crystal display of claim 7 , wherein
a long axis of the first compound is oriented in a direction that is inclined with respect to a surface of the first display panel facing the second display panel, and the liquid crystal molecules are pre-tilted according to the orientation of the long axis of the first compound.
9. The liquid crystal display of claim 1 , wherein
the first display panel further comprises a thin film transistor, a color filter, and a pixel electrode, and the second display panel comprises a common electrode.
10. The liquid crystal display of claim 9 , wherein
the first display panel further comprises a light blocking member.
11. The liquid crystal display of claim 10 , wherein
the pixel electrode comprises a minute branch electrode.
12. The liquid crystal display of claim 10 , wherein:
the first display panel further comprises a first substrate, a gate line disposed on the first substrate, a first data line disposed on the first substrate, and a second data line disposed on the first substrate;
the thin film transistor comprises a first thin film transistor connected to the gate line and the first data line and a second thin film transistor connected to the gate line and the second data line; and
the pixel electrode comprises 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.
13. A method for manufacturing a liquid crystal display comprising:
forming an alignment layer at a first display panel;
forming a liquid crystal layer comprising a reactive mesogen and liquid crystal molecules between the first display panel and a second display panel;
applying a voltage to the liquid crystal layer; and
irradiating the liquid crystal layer with light,
wherein the alignment layer is formed of a composition comprising:
a dianhydride-based compound, and
a compound represented by Chemical Formula 1:
wherein R 1 is a substituted or non-substituted C 1 -C 8 alkyl group, R 2 is a substituted or non-substituted C 8 -C 30 alkyl group, and A 1 is a functional group comprising a substituted or non-substituted aliphatic ring and a substituted or non-substituted aromatic ring.
14. The method of claim 13 , wherein
the composition further comprises a compound represented by Chemical Formula 2:
wherein B 1 is an oxygen atom, a carbonyl group, or a carboxylic group, and A 2 is a functional group comprising an aliphatic ring.
15. The method of claim 14 , wherein
a ratio of the sum of a number of moles of the compound represented by Chemical Formula 1 and the compound represented by Chemical Formula 2 to a number of moles of the dianhydride-based compound is more than about ⅓.
16. The method of claim 14 , wherein
the composition further comprises a compound represented by Chemical Formula 3:
wherein B 2 and B 3 are independently OH, O, or COOH.
17. The method of claim 13 , wherein
the compound represented by the above Chemical Formula 1 includes a compound represented by the following Chemical Formula 4, a compound represented by the following Chemical Formula 5, or a mixture thereof:
18. The method of claim 13 , wherein
the compound represented Chemical Formula 1 includes a compound represented by the following Chemical Formula 6, a compound represented by the following Chemical Formula 7, a compound represented by the following Chemical Formula 8, a compound represented by the following Chemical Formula 9, or mixtures thereof:
19. The method of claim 13 , wherein
the light is ultraviolet rays.
20. The method of claim 13 , wherein
a first compound is synthesized from the reactive mesogen by the irradiation of the light, and the first compound is an oligomer, a polymer, or a mixture thereof.
21. The method of claim 20 , wherein
a direction that a long axis of the first compound is oriented is a direction that is inclined with respect to a surface of the first display panel facing the second display panel, and the liquid crystal molecules are pre-tilted according to the direction that the long axis of the first compound is oriented.