Display device and optical inspection method for the same

An optical inspection method comprising:

• preparing a display device including a light emitting element which emits light, wherein the display device outputs the light in a display direction;
• preparing an optical inspection device which receives the light output from the display device;
• locating the optical inspection device on a front surface of the display device;
• and
• acquiring optical information of the display device, based on the light provided from the display device,
• wherein the optical inspection device includes:
• a main body including a light receiving part which receives light provided thereto, wherein the light receiving part includes a polarizer having a predetermined polarizing axis, and an image processor which acquires electrical information, based on the light provided to the light receiving part;
• a lens part which receives light provided from an outside, wherein the lens part provides the light provided from the outside to the light receiving part;
• and
• a phase film part having a phase difference of about 4000 nm,
• wherein the optical inspection device includes a polarizing part having an absorption axis and a transmission axis, and
• wherein an angle between the predetermined polarizing axis of the polarizer and one of the absorption axis and the transmission axis is in a range of about 25 degrees to about 65 degrees.