Flexible display device including plurality of protrusions

A flexible display device, comprising:

• a substrate;
• a display unit formed over the substrate;
• an encapsulation substrate formed over the substrate and the display unit and including a base layer and a plurality of protrusions formed over a first surface of the base layer;
• a filler interposed between the substrate and the encapsulation substrate so as to cover the display unit;
• and
• a barrier layer formed over the first surface so as to cover i) the protrusions and ii) a portion of the base layer exposed between the plurality of protrusions,
• wherein the substrate, the filler, and the encapsulation substrate are configured to be stretched in two dimensions, and
• wherein each of the plurality of protrusions comprises:
• a first end portion contacting the first surface;
• and
• a second end portion formed opposite the first end portion,
• wherein an elongation percentage of the encapsulation substrate at the first end portion is greater than an elongation percentage of the encapsulation substrate between the plurality of protrusions when the encapsulation substrate is stretched.