Patent ID: 7255968

Claim:
A method for aligning an exposure mask comprising: performing a first exposure to a substrate by using a first hologram mask to which a first pattern is formed; performing a first alignment between the substrate and a second hologram mask by using a first alignment mark included in the first pattern formed on the substrate by the first exposure and a second alignment mark included in a second pattern that is formed on the second hologram mask and that includes a third alignment mark; performing a second exposure to the substrate by using the second hologram mask; performing a second alignment between the substrate and a third hologram mask by using the third alignment mark included in the second pattern formed on the substrate by the second exposure and a fourth alignment mark included in a third pattern that is formed on the third hologram mask and that includes a fifth alignment mark; and performing a third exposure to the substrate by using the third hologram mask, a distance between the second alignment mark included in the second pattern formed on the substrate by the second exposure and the third alignment mark included in the second pattern formed on the substrate by the second exposure being larger than a predetermined value, a distance between the fourth alignment mark included in the third pattern formed on the substrate by the third exposure and the fifth alignment mark included in the third pattern formed on the substrate by the third exposure being larger than the predetermined value, and a distance between the first alignment mark included in the first pattern formed on the substrate by the first exposure and the fifth alignment mark included in the third pattern formed on the substrate by the third exposure being smaller than the predetermined value.