Method of manufacturing OLED display device, mask, and method of designing mask
View Patent ↗A method of manufacturing an OLED display deposits an OLED material onto an electrode surface of a substrate through a mask while moving a linear source having nozzles in a first direction. The mask has holes in a surface facing the linear source. Each hole has a first opening and a larger second opening located between the first opening and the linear source. θT<90−θM and SX>D1×tan θM are satisfied. D1 is a distance from the first opening to the electrode surface. θM is the largest incident angle in the first direction of the OLED material. SX is a distance in the first direction from an edge of the first opening to an adjacent sub-pixel electrode. θT is a taper angle defined by a line connecting the edge of the first opening and the edge of the second opening and the first direction.
1. A method of manufacturing an OLED display device comprising:
depositing an organic light-emitting material onto an electrode surface of a substrate through a mask while moving a linear source having a plurality of nozzles in a first direction,
wherein the mask has a plurality of holes in a surface facing the linear source,
wherein each of the plurality of holes has a first opening and a second opening larger than the first opening and the second opening is located between the first opening and the linear source, and
wherein relations of θT<90−θM and SX>D1×tan θM are satisfied, where
D1 is a distance from the first opening to the electrode surface,
θM is the largest incident angle in the first direction of the organic light-emitting material,
SX is a distance in the first direction from an edge of the first opening to an edge of an adjacent sub-pixel electrode, and
θT is a taper angle defined by a line connecting the edge of the first opening and the edge of the second opening and the first direction.
2. The manufacturing method according to claim 1 ,
wherein the mask has a plurality of second holes stacked on the plurality of holes in the reverse surface of the surface facing the linear source,
wherein each of the plurality of second holes has a third opening larger than the first opening and the third opening is located between the first opening and the substrate, and
wherein a relation of θS<90−θM is satisfied, where θS is a step angle defined by a line connecting the edge of the first opening and an edge of the third opening and the first direction.
3. The manufacturing method according to claim 2 , wherein a relation of SY>D1×tan θM is satisfied, where SY is a distance from the edge of the first opening to an edge of the electrode surface exposed from the first opening.
4. The manufacturing method according to claim 2 ,
wherein a rated variation ΔTp for pitch of the first openings, a rated variation ΔCd for size of the first openings, and a rated variation ΔAe for alignment are predefined, and
wherein a relation of SX>D1×tan(θM)+(ΔTp 2 +ΔCd 2 +ΔAe 2 ) 1/2 is satisfied.
5. The manufacturing method according to claim 1 , wherein a relation of SY>D1×tan θM is satisfied, where SY is a distance from the edge of the first opening to an edge of the electrode surface exposed from the first opening.
6. The manufacturing method according to claim 5 ,
wherein a rated variation ΔTp for pitch of the first openings, a rated variation ΔCd for size of the first openings, and a rated variation ΔAe for alignment are predefined, and
wherein a relation of SX>D1×tan(θM)+(ΔTp 2 +ΔCd 2 +ΔAe 2 ) 1/2 is satisfied.
7. The manufacturing method according to claim 1 ,
wherein a rated variation ΔTp for pitch of the first openings, a rated variation ΔCd for size of the first openings, and a rated variation ΔAe for alignment are predefined, and
wherein a relation of SX>D1×tan(θM)+(ΔTp 2 +ΔCd 2 +ΔAe 2 ) 1/2 is satisfied.
8. The manufacturing method according to claim 7 , wherein a relation of SY>D1×tan(θM)+(ΔTp 2 +ΔCd 2 +ΔAe 2 ) 1/2 is satisfied.
9. The manufacturing method according to claim 1 ,
wherein the organic light-emitting material is an organic light-emitting material for a first color, and
wherein an organic light-emitting material for a second color is vapor deposited onto the adjacent sub-pixel electrode.
10. A mask to be placed between an electrode surface of a substrate and a linear source including a plurality of nozzles and being configured to move in a first direction for deposition of an organic light-emitting material onto the electrode surface, the mask comprising:
a surface to face the linear source, the surface having a plurality of holes,
wherein each of the plurality of holes has a first opening and a second opening larger than the first opening and the second opening is to be located between the first opening and the linear source, and
wherein relations of θT<90−θM and SX>D1×tan θM are satisfied, where
D1 is a distance between the first opening and the electrode surface,
θM is the largest incident angle in the first direction of the organic light-emitting material,
SX is a distance in the first direction from an edge of the first opening to an edge of an adjacent sub-pixel electrode, and
θT is a taper angle defined by a line connecting the edge of the first opening and the edge of the second opening and the first direction.
11. The mask according to claim 10 , further comprising another surface having a plurality of second holes stacked on the plurality of holes on the reverse side of the surface to face the linear source,
wherein each of the plurality of second holes has a third opening larger than the first opening and the third opening is to be located between the first opening and the substrate, and
wherein a relation of θS<90−θM is satisfied, where θS is a step angle defined by a line connecting the edge of the first opening and an edge of the third opening and the first direction.
12. The mask according to claim 11 , wherein a relation of SY>D1×tan θM is satisfied, where SY is a distance from the edge of the first opening to an edge of the electrode surface exposed from the first opening.
13. The mask according to claim 12 ,
wherein a rated variation ΔTp for pitch of the first openings, a rated variation ΔCd for size of the first openings, and a rated variation ΔAe for alignment are predefined, and
wherein a relation of SX>D1×tan(θM)+(ΔTp 2 +ΔCd 2 +ΔAe 2 ) 1/2 is satisfied.
14. The mask according to claim 11 ,
wherein a rated variation ΔTp for pitch of the first openings, a rated variation ΔCd for size of the first openings, and a rated variation ΔAe for alignment are predefined, and
wherein a relation of SX>D1×tan(θM)+(ΔTp 2 +ΔCd 2 +ΔAe 2 ) 1/2 is satisfied.
15. The mask according to claim 10 , wherein a relation of SY>D1×tan θM is satisfied, where SY is a distance from the edge of the first opening to an edge of the electrode surface exposed from the first opening.
16. The mask according to claim 15 ,
wherein a rated variation ΔTp for pitch of the first openings, a rated variation ΔCd for size of the first openings, and a rated variation ΔAe for alignment are predefined, and
wherein a relation of SX>D1×tan(θM)+(ΔTp 2 +ΔCd 2 +ΔAe 2 ) 1/2 is satisfied.
17. The mask according to claim 10 ,
wherein a rated variation ΔTp for pitch of the first openings, a rated variation ΔCd for size of the first openings, and a rated variation ΔAe for alignment are predefined, and
wherein a relation of SX>D1×tan(θM)+(ΔTp 2 +ΔCd 2 +ΔAe 2 ) 1/2 is satisfied.
18. The mask according to claim 17 , wherein a relation of SY>D1×tan (θM)+(ΔTp 2 +ΔCd 2 +ΔAe 2 ) 1/2 is satisfied.
19. A method of designing a mask to be placed between a linear source and an electrode surface of a substrate for deposition of an organic light-emitting material onto the electrode surface,
the linear source including a plurality of nozzles and being configured to move in a first direction,
the mask having a plurality of holes in a surface to face the linear source,
each of the plurality of holes having a first opening and a second opening larger than the first opening, the second opening being to be located between the first opening and the linear source, and
the designing method comprising:
predefining values of a largest incident angle θM in the first direction of the organic light-emitting material and a distance SX in the first direction from an edge of the first opening to an edge of an electrode of an adjacent sub-pixel; and
determining values for a distance D1 between the first opening and the electrode surface and a taper angle θT defined by a line connecting the edge of the first opening and the edge of the second opening and the first direction in such a manner that relations of θT<90−θM and SX>D1×tan θM are satisfied.
20. The designing method according to claim 19 , further comprising:
predefining values of a rated distance SY from an edge of the first opening to an edge of the electrode surface exposed from the first opening; and
determining a value for the distance D1 from the first opening to the electrode surface in such a manner that a relation of SY>D1×tan θM is satisfied.