Deposition mask and method for manufacturing organic light emitting display using the same
A deposition mask for manufacturing an organic light emitting display (OLED) using the same are provided. The deposition mask is intended for preventing an organic film from being damaged due to touching of a blocked-off portion of the mask to an emission layer (EML), or chemical transition from being generated at the organic film. For that purpose, the deposition mask stuck to a substrate of the OLED to deposit an organic EML includes an opening and an indentation. The opening is opened so as to deposit the organic EML. The indentation is indented a predetermined depth from a plane facing the substrate.
1. A deposition mask, comprising:
a planar portion; and
unit masks, each unit mask comprising:
a single first opening and two first indentations arranged in a first row in the planar portion; and
a plurality of second openings and a plurality of second indentations arranged in a second row in the planar portion,
wherein:
the first and second openings are configured to permit deposition of an organic emission layer on a substrate of an organic light emitting display;
the first and second indentations are disposed on a side of the planar portion configured to face the substrate;
the first and second indentations are configured to cover a previously deposited organic emission layer being disposed within the indentation;
the previously deposited organic emission layer is formed in a sub-pixel;
the first and second indentations are indented from the surface facing the substrate to a depth greater than a thickness of the previously deposited organic emission layer and less than half of a thickness of the deposition mask;
a shape of the first opening is different from a shape of the second opening; and
the first and second rows are spaced laterally apart from each other.
2. The mask of claim 1 , wherein each of the first and second openings corresponds to an organic emission layer of a first color, and the previously deposited organic emission layer is of a second color different from the first color.
3. The mask of claim 1 , wherein the organic light emitting display comprises a red emission region with a red organic emission layer, a green emission region with a green organic emission layer, and a blue emission region with a blue organic emission layer, and
wherein the first and second openings are configured to permit deposition of an organic emission layer of a first color, and the indentation corresponds to organic emission layers of a plurality of other colors.
4. The mask of claim 1 , wherein the organic light emitting display comprises a red sub-pixel with a red organic emission layer, a green sub-pixel with a green organic emission layer, and a blue sub-pixel with a blue organic emission layer,
wherein the first and second openings are configured to permit deposition of an organic emission layer of a sub-pixel of a first color, and the indentation corresponds to regions ranging from sub-pixels of the first color deposited to sub-pixels of other colors.
5. The mask of claim 1 ,
wherein the width of at least one of the two first indentations is different from the width of at least one of the second indentations.
6. The mask of claim 1 , wherein the first and second openings are completely uncovered on both the side of the planar portion configured to face the substrate and a side of the planar portion configured to face away from the substrate.