Optical sheet and method of manufacturing the same

A method of manufacturing an optical sheet, comprising:

• forming a plurality of light-passing second patterns on one surface of an auxiliary base sheet to allow the plurality of light-passing second patterns to protrude above the auxiliary base sheet;
• forming a plurality of light-passing first patterns on a front surface of a base sheet to allow the plurality of light-passing first patterns to protrude above the base sheet;
• forming a first adhesive layer on a rear surface of the base sheet;
• coupling the plurality of light-passing second patterns that are disposed on the auxiliary base sheet with the base sheet such that the plurality of light-passing second patterns make contact with the first adhesive layer and such that an air layer is defined between the plurality of light-passing second patterns and the base sheet;
• and
• removing the auxiliary base sheet.