a method for quickly applying and spreading adhesive between substrates without leaving air bubbles . the method includes holding two substrates apart from each other with adhesive sides facing , a second substrate being positioned above a first substrate . the second substrate is suspended in a manner so as to cause a portion to warp towards the first substrate . after a liquid filler is applied between the two substrates , rollers are lowered onto the second substrate and moved so as to disperse the liquid filler between the first and second substrates . in accordance with the rolling of the rollers , end portions of the second substrate are lowered towards the first substrate .