like wherein the sealing layer 52 may be formed to have a thickness between about 5 u03bcm to about 500 u03bcm the sealing layer 52 may be formed of a thermal hardening adhesive furthermore the sealing layer 52 may be formed of a thermal sheet since the sealing layer 52 is formed on the substrate 1 to completely cover the passivation film 4 as described above the adhesive layer 22 may be formed on an entire surface of the metal sheet 2 in this case the adhesiveness between the metal sheet 2 and the sealing layer 52 may be significantly improved due to the adhesive layer 22 the adhesive layer 22 may be formed to have a thickness between about 0 1 u03bcm to about 10 u03bcm if the thickness of the adhesive layer 22 is smaller than 0 1 u03bcm it is difficult to expect improved adhesiveness due to the adhesive layer 22 in contrast if the thickness of the adhesive layer 22 exceeds 10 u03bcm excessive time and energy are consumed for formation of the adhesive layer 22 and thus productivity decreases furthermore in this case moisture or oxygen may permeate through the adhesive layer 22 next referring to fig3 through 5 a method of manufacturing the organic light emitting display device of fig1 according to an embodiment of the present invention will be.