Patent ID: 7371508

Claim:
A method for forming a rib pattern, having rib portions of relatively lower and higher heights, on a substrate of a plasma display panel, the method comprising: forming a first photosensitive rib material layer, having a thickness corresponding to the height of the lower height rib portions, on the substrate, the lower height rib portions corresponding to rib portions extending in a first direction; disposing thereon a first photolithographic mask having a pattern defining the lower height rib portions, followed by exposure; without development, superimposing on the first photosensitive rib material layer a second photosensitive rib material layer, a combined thickness of the first and second photosensitive rib material layers being substantially equal to the height of the higher height rib portions, the higher height rib portions corresponding to rib portions extending in a second direction, perpendicular to the first direction; disposing on the second photosensitive rib material layer a second photolithographic mask having a pattern defining the higher height rib portions, followed by exposure; and developing by removing the first and second photosensitive rib material layers, except for the lower and higher height rib portions defined respectively by the exposure with said photolithographic masks.