Display device and manufacturing method thereof

A manufacturing method of a display device, the method comprising:

• providing a display module which is bendable at a bending area thereof, the display module including:
• a display panel which displays an image,
• a passivation film including a polyimide, the passivation film disposed in the bending area and outside of the bending area, and
• an adhesive layer which attaches the display panel to the passivation film, the adhesive layer comprising a first adhesive portion in the bending area and a second adhesive portion outside of the bending area;
• reducing an adhesive force of the first adhesive portion of the adhesive layer to be smaller than an adhesive force of the second adhesive portion of the adhesive layer, by irradiating a first laser to the adhesive layer at the bending area, to provide the first adhesive portion which has reduced adhesive force;
• providing a groove in the passivation film and in the adhesive layer, along a boundary of the bending area;
• and
• removing the passivation film and the first adhesive portion which has the reduced adhesive force, from the display panel, at the groove,
• wherein the first laser is a CO2 laser.