Abstract
This research proposed a method that compensates the recess of the first OLED layer resulted from wet process by a second inkjet printing. The inkjet printing filled the material to the recess resulted in the first layer because of the coffee ring effects with precise positioning, in order to improve the current distribution and light emitting uniformity. This research obtained the recess of the first layer by integration and reduced 73% recess volume with sequence, direction, overlap ratio, and segment amount optimizations. This research not only provided a methodology that evaluates the dry-film uniformity by standard deviation between the two peaks of the recess quantitatively, but also proved that the transmittance and the resistivity resulted from this method reduced and increased less than 1.5% and 15%, respectively. These result implied that the dry-film uniformity can be improved without extra facilities, material, and processes for the hydrophilicity and hydrophobicity of OLED.