Method of manufacturing alignment film and liquid crystal display device

1. A method of manufacturing an alignment film, comprising the steps of:

forming an organic layer on a substrate by applying a material of the organic layer on the substrate and heating the applied material of the organic layer;

irradiating polarized ultraviolet rays onto the organic layer to impart thereto an alignment controllability of liquid crystal molecules;

heating the organic layer irradiated with the polarized ultraviolet rays at 170° C. to 270° C.;

oxidating the heated organic layer;

washing the oxidated organic layer;

drying the washed organic layer, and

heating the dried organic layer, thereby removing carbon dioxide from the dried organic layer.

2. The method of claim 1 , to be employed for manufacture of a liquid crystal display device which uses a frame frequency of less than 60 Hz.

3. The method of claim 1 , wherein

a ratio of a nitrogen concentration to a total value of an oxygen concentration, a carbon concentration and the nitrogen concentration in a surface of the alignment film, which is not in contact with the substrate, is higher than a ratio of a nitrogen concentration to a total value of an oxygen concentration, a carbon concentration and the nitrogen concentration inside the alignment film.

4. The method of claim 1 , wherein

the step of washing comprises washing the oxidated organic layer with an organic solvent selected from the group consisting of a ketone-based solvent, an ester-based solvent, an ether-based solvent, an alcohol-based solvent, a hydrocarbon-based solvent and a halogenated hydrocarbon-based solvent.

5. The method of claim 1 , wherein

a temperature at which the dried organic layer is heated is 170° C. to 270° C.

6. The method of claim 5 , to be employed for manufacture of a liquid crystal display device which uses a frame frequency of less than 60 Hz.