Patent ID: 11859274
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H  B | IPC B  C  H

Claim 0:
1. A manufacturing method of an organic EL display device, the manufacturing method comprising:
a deposition step of depositing an organic material on a substrate using a deposition mask in which a plurality of through-holes are formed,
wherein the deposition mask comprises:
a first surface and a second surface, in which the plurality of through-holes are formed;
a pair of long side surfaces connected to the first surface and the second surface, and defining a profile of the deposition mask in a longitudinal direction of the deposition mask; and
a pair of short side surfaces connected to the first surface and the second surface, and defining a profile of the deposition mask in a width direction of the deposition mask;
wherein the through-hole includes a first recess formed the first surface, and a second recess formed the second surface and connected to the first recess through a hole connection portion;
wherein the first recess includes a wall surface extending from the hole connection portion to the first surface, the second recess includes a wall surface extending from the hole connection portion to the second surface, a height of the wall surface of the first recess is smaller than the height of the wall surface of the second recess, and the height of the wall surface of the first recess is equal to or less than 6 μm,
wherein each of the long side surfaces includes a first portion that is recessed inside, the first position including a first end portion positioned along the first surface, and a second end portion positioned along the second surface and positioned inside the first end portion; and
wherein the first end portion of the first portion of the long side surface is positioned closer to the first surface than the hole connection portion.