Photoalignment material, display substrate having an alignment layer formed using the same, and to a method of manufacturing the display substrate

1. A photoalignment material, comprising:

an alignment polymer;

a photoalignment additive including a chemical compound represented by the following Chemical Formula 1; and

an organic solvent,

wherein R 1 represents a cyclic compound, A and B independently represent a single bond or —(C n H 2n )—, and “n” represents an integer in a range of 1 to 12, and each —CH 2 — of A and/or B is replaceable with

R 3 represents an alkyl group having 1 to 12 carbon atoms, and each —CH 2 — of A and/or B is replaceable with —O—, and R 4 represents

and each hydrogen atom excluding hydrogen atoms of R 4 is replaceable with chlorine (Cl) or fluorine (F).

2. The photoalignment material of claim 1 , wherein the cyclic compound includes one selected from the group consisting of cyclohexane, benzene, chroman, naphthalene, tetrahydrofuran and dioxane.

3. The photoalignment material of claim 1 , wherein the photoalignment additive comprises a chemical compound represented by the following Chemical Formula 2,

4. The photoalignment material of claim 1 , wherein the alignment polymer has a main chain including at least one selected from the group consisting of a polyimide compound, a polyamic acid compound, a polysiloxane compound, a polyvinyl cinnamate compound, a polyacrylate compound, and a polymethyl methacrylate compound.

5. The photoalignment material of claim 4 , wherein the alignment polymer has a photoreactive branch group coupled to the main chain and capable of having an orientation due to light.

6. The photoalignment material of claim 1 , wherein the organic solvent comprises at least one selected from the group consisting of chlorobenzene, N-methyl pyrrolidone, dimethylsulfoxide, dimethylformamide, toluene, chloroform, γ-butyrolactone, methyl cellosolve, butyl cellosolve, butyl carbitol, and tetrahydrofuran.

7. The photoalignment material of claim 1 , wherein the content of the alignment polymer is about 0.5% to about 15% by weight, and the content of the photoalignment additive is about 0.01% to about 6% by weight, and the content of the organic solvent is about 84% to about 99% by weight.

8. A display substrate, comprising:

a switching element formed on a base substrate and electrically connected to a gate line and a data line crossing the gate line;

a pixel electrode electrically connected to the switching element; and

an alignment layer formed on the base substrate having the pixel electrode and including a photoreactive portion coupled to an alignment polymer and represented by the following Chemical Formula 1A,

wherein R 1 represents cyclohexane, benzene, chroman, naphthalene, tetrahydrofuran or dioxane, and each of A and B represents a single bond or —(C 2 H 2n )—, and “n” represents an integer in a range of 1 to 12, and each —CH 2 — of A and/or B is replaceable with

R 3 represents an alkyl group having 1 to 12 carbon atoms, and each —CH 2 — of A and/or B is replaceable with —O—, and each hydrogen atom is replaceable with chlorine (Cl) or fluorine (F).

9. A display substrate, comprising:

a plurality of color filters formed on a base substrate;

a common electrode layer formed on the color filters; and

an alignment layer formed on the common electrode layer and including a photoreactive portion coupled to an alignment polymer and represented by the following Chemical Formula 1A,

wherein R 1 represents cyclohexane, benzene, chroman, naphthalene, tetrahydrofuran, dioxane, and each of A and B represents a single bond or —(C n H 2n )—, and “n” represents an integer in a range of 1 to 12, and each —CH 2 — of A and/or B is replaceable with —O—,

R 3 represents an alkyl group having 1 to 12 carbon atoms, and each —CH 2 — of A and/or B is replaceable with —O—, and each hydrogen atom is replaceable with chlorine (Cl) or fluorine (F).