Liquid crystal photo alignment agent and method of manufacturing liquid crystal display using the same
Provided is a liquid crystal photo alignment agent including: a solid including at least one of a polyimide polymer, cyclobutane dianhydride (CBDA) or diamine; a first solvent including at least one of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, dimethyl sulfoxide, dimethyl formamide, γ-butyrolacton or propylene carbonate; and a second solvent including at least one of propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, propylene glycol n-propyl ether, diethylene glycol diethyl ether or diacetone alcohol, wherein the first solvent is included in an amount of about 50 wt % to about 80 wt % based on the total weight of the liquid crystal photo alignment agent; and the second solvent is included in an amount of about 15 wt % to about 40 wt % based on the total weight of the liquid crystal photo alignment agent. Also provided is a method of manufacturing a liquid crystal display including the liquid crystal photo alignment agent.
1. A liquid crystal photo alignment agent, comprising:
a solid comprising a polyimide polymer, cyclobutane dianhydride, diamine, or a combination thereof;
a first solvent comprising N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, dimethyl sulfoxide, dimethyl formamide, γ-butyrolactone, propylene carbonate, or a combination thereof; and
a second solvent comprising propylene glycol monobutyl ether and dipropylene glycol monomethyl ether,
wherein the first solvent is included in an amount of about 50 wt % to about 80 wt % based on the total weight of the liquid crystal photo alignment agent; and
the second solvent is included in an amount of about 15 wt % to about 40 wt % based on the total weight of the liquid crystal photo alignment agent, and the dipropylene glycol monomethyl ether is included in an amount of about 5 wt % to about 20 wt % based on the total weight of the liquid crystal photo alignment agent.
2. The liquid crystal photo alignment agent of claim 1 , wherein the solid is included in an amount of about 2 wt % to about 10 wt % based on the total weight of the liquid crystal photo alignment agent.
3. The liquid crystal photo alignment agent of claim 1 , wherein the first solvent is N-methyl-2-pyrrolidone and N-ethyl-2-pyrrolidone.
4. The liquid crystal photo alignment agent of claim 3 , wherein the N-methyl-2-pyrrolidone is included in an amount of about 40 wt % to about 70 wt % based on the total weight of the liquid crystal photo alignment agent.
5. The liquid crystal photo alignment agent of claim 3 , wherein the N-ethyl-2-pyrrolidone is included in an amount of about 10 wt % to about 40 wt % based on the total weight of the liquid crystal photo alignment agent.
6. The liquid crystal photo alignment agent of claim 1 , wherein
the first solvent is N-methyl-2-pyrrolidone and N-ethyl-2-pyrrolidone, and
wherein, based on the total weight of the liquid crystal photo alignment agent, the liquid crystal photo alignment agent comprises about 2 wt % to about 10 wt % of the solid, about 40 wt % to about 70 wt % of the N-methyl-2-pyrrolidone, about 10 wt % to about 40 wt % of the N-ethyl-2-pyrrolidone, about 10 wt % to about 30 wt % of the propylene glycol monobutyl ether, and about 5 wt % to about 20 wt % of the dipropylene glycol monomethyl ether.
7. The liquid crystal photo alignment agent of claim 1 , wherein the propylene glycol monobutyl ether is included in an amount of about 10 wt % to about 30 wt % based on the total weight of the liquid crystal photo alignment agent.
8. The liquid crystal photo alignment agent of claim 1 , wherein the dipropylene glycol monomethyl ether is included in an amount of about 10 wt % to about 20 wt % based on the total weight of the liquid crystal photo alignment agent.
9. A liquid crystal display device, comprising:
a first substrate including a first base substrate;
a circuit layer disposed on the first base substrate;
a pixel electrode layer disposed on the circuit layer; and
a first alignment layer on the pixel electrode layer, wherein the first alignment layer comprises a liquid crystal photo alignment agent comprising:
a solid comprising a polyimide polymer, cyclobutane dianhydride, diamine, or a combination thereof;
a first solvent comprising N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, dimethyl sulfoxide, dimethyl formamide, γ-butyrolactone, propylene carbonate, or a combination thereof; and
a second solvent comprising propylene glycol monobutyl ether and dipropylene glycol monomethyl ether;
wherein the first solvent is included in an amount of about 50 wt % to about 80 wt % based on the total weight of the liquid crystal photo alignment agent; and
the propylene glycol monobutyl ether is included in an amount of about 10 wt % to about 30 wt % based on the total weight of the liquid crystal photo alignment agent and the dipropylene glycol monomethyl ether is included in an amount of about 5 wt % to about 20 wt % based on the total weight of the liquid crystal photo alignment agent.
10. The liquid crystal display of claim 6 , wherein the liquid crystal display has Δangle of less than 0.3, wherein Δangle is an angle between S IN and S OFF , S IN indicates an angle at an initial alignment state of a liquid crystal in the absence of an electric field, and S ON indicates an angle at an alignment state of a liquid crystal under in the presence of an electric field.