Patent ID: 7445724

Claim:
A method for manufacturing a printing plate comprising: forming a hard mask layer having at least one opening on an insulating substrate; forming at least one first trench in the insulating substrate corresponding to the at least one opening of the hard mask layer, the at least one first trench having a first depth; forming a first etching stopper and a first photoresist sequentially on a surface of the insulating substrate including the at least one first trench; patterning the first etching stopper and the first photoresist such that a portion of the first etching stopper and a portion of the first photoresist remain at sidewalls of the at least one first trench, wherein the step of patterning the first etching stopper and the first photoresist comprises exposing the first photoresist using the hard mask layer as a mask, developing the exposed first photoresist and etching the first etching stopper using the developed first photoresist as a mask; forming at least one second trench in the insulating substrate, each of the at least one second trench corresponding to each at least one first trench respectively, wherein the at least one second trench has a second depth greater than the first depth.