METHOD FOR MANUFACTURING ORGANIC EL DISPLAY DEVICE AND ORGANIC EL DISPLAY DEVICE

• US 20170301889A1
• Filed: 08/06/2015
• Published: 10/19/2017
• Est. Priority Date: 09/24/2014
• Status: Active Grant

• Current Assignee: JDI Design and Development GK
• Original Assignee: JOLED Inc.
• Inventors: HAYASHIDA, Yoshiki, KOBAYASHI, Kazuhiro, ONIMARU, Toshiaki, SHIMAMURA, Takayuki
• Granted Patent: US 10,243,176 B2
• Time in Patent Office: Days
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/135 using ink-jet printing
• CPC Class Codes: H10K 71/164 using vacuum deposition
• CPC Class Codes: H10K 71/40 Thermal treatment, e.g. annealing in the presence of a solvent vapour
• CPC Class Codes: H10K 71/861 Repairing

Abstract

A method for repairing a bank during manufacture of an organic EL display device when a bank defect portion is produced due to collapsing of a bank, a foreign particle, or the like. The method includes: detecting a defect portion of a lengthwise bank formed over a ground substrate; and when a defect portion is detected, forming, in each of adjacent concave spaces between which the lengthwise bank having the defect portion is located, a dam partitioning the concave space into a first space in a vicinity of the bank defect portion and a second portion not in the vicinity of the bank defect portion. The shape of the dam is configured so that in ejecting organic functional layer ink in each concave space with a nozzle head, there is an ink dropping point in each of the first space and the second space.

Claims

1. A method of manufacturing an organic electroluminescence (EL) display device by forming banks over a substrate and forming an organic functional layer in each of a plurality of concave spaces partitioned from one another by the banks, the method comprising:

detecting a defect portion of a bank;

when a bank defect portion is detected, forming, in each of adjacent concave spaces, among the plurality of concave spaces, between which one of the banks having the bank defect portion is located, one or more dams partitioning the concave space into a first space in a vicinity of the bank defect portion and a second portion not in the vicinity of the bank defect portion; and

then forming the organic functional layer in each of the plurality of concave spaces by causing a nozzle head to eject ink into the concave spaces, wherein

in the forming of the organic functional layer, there is an ink dropping point where the nozzle head ejects the ink in each of the first space and the second space.

2. The method of claim 1 further comprising

forming lengthwise banks extending in parallel in one direction along a surface of the substrate, the lengthwise banks partitioning the plurality of concave spaces from one another, wherein

in the forming of the organic functional layer, there are a plurality of ink dropping points along each of one or more ink dropping lines extending in the one direction, in each of the plurality of concave spaces, and

the one or more dams are provided with a shape such that, in a concave space in which the one or more dams are formed, a length of at least one of the ink dropping lines in the first space is greater than a pitch of ink dropping points along the ink dropping line.

3. The method of claim 1 further comprising:

forming elongated widthwise banks extending in parallel along a surface of the substrate; and

forming lengthwise banks extending in parallel in one direction along the surface of the substrate, the lengthwise banks intersecting the widthwise banks and having greater height than the widthwise banks, wherein

in the forming of the one or more dams, one dam is formed with there being a space between the one dam and a widthwise bank adjacent to the one dam, and

in the forming of the organic functional layer, there is an ink dropping point in the space between the one dam and the adjacent widthwise bank.

4. The method of claim 3, wherein

the lengthwise banks partition the plurality of concave spaces from one another,

in the forming of the organic functional layer, there are a plurality of ink dropping points along each of one or more ink dropping lines extending in the one direction, in each of the plurality of concave spaces, and

the one dam is formed so that, in a concave space in which the one dam is formed, a length of at least one of the ink dropping lines in the space between the one dam and the adjacent widthwise bank is greater than a distance between the adjacent widthwise bank and an ink dropping point nearest the adjacent widthwise bank.

5. The method of claim 1 further comprising

forming lengthwise banks extending in parallel in one direction along a surface of the substrate, the lengthwise banks partitioning the plurality of concave spaces from one another, wherein

in each of the adjacent concave spaces between which one of the lengthwise banks having the bank defect portion is located, two dams are formed, the two dams extending from different ones of two points on the lengthwise bank having the bank defect portion to a lengthwise bank adjacent to the lengthwise bank having the bank defect portion, the two points being at different sides of the bank defect portion in the one direction,

in the forming of the organic functional layer, there are a plurality of ink dropping points along each of one or more ink dropping lines extending in the one direction, in each of the plurality of concave spaces, the ink dropping lines intersecting with the two dams, and

the two dams are formed so that along at least one of the ink dropping lines, a distance between the two dams is greater than a pitch of ink dropping points.

6. The method of claim 1 further comprising

forming lengthwise banks extending in parallel in one direction along a surface of the substrate, the lengthwise banks partitioning the plurality of concave spaces from one another, wherein

in each of the adjacent concave spaces between which one of the lengthwise banks having the bank defect portion is located, one dam is formed, the one dam extending from one to the other of two points on the lengthwise bank having the bank defect portion while detouring around the bank defect portion, the two points being at different sides of the bank defect portion in the one direction,

in the forming of the organic functional layer, there are a plurality of ink dropping points along each of one or more ink dropping lines extending in the one direction, in each of the plurality of concave spaces, and

the one dam is formed so that along at least one of the ink dropping lines that intersects the one dam at two positions of the one dam, a distance between the two positions of the one dam is greater than a pitch of ink dropping points.

7. The method of claim 6, wherein

the one dam comes in contact with a lengthwise bank adjacent to the lengthwise bank having the bank defect portion at some point along a path between the two points.

8. The method of claim 6, wherein

the one dam does not come in contact with a lengthwise bank adjacent to the lengthwise bank having the bank defect portion, and

in a concave space in which the one dam is formed, a distance between the at least one of the ink dropping lines and the lengthwise bank having the bank defect portion is smaller than a separation distance that is a distance from the lengthwise bank having the bank defect portion to a portion of the one dam that is farthest from the lengthwise bank having the bank defect portion.

9. The method of claim 1 further comprising:

forming lengthwise banks extending in parallel in one direction along the surface of the substrate, the lengthwise banks partitioning the plurality of concave spaces from one another; and

forming, in each of the plurality of concave spaces, widthwise banks having smaller height than the lengthwise banks, wherein

the forming of the one or more dams is performed so that one or more dams are formed on the widthwise banks.

10. The method of claim 1, wherein

in the forming of the organic functional layer:

the ink is applied to each of the plurality of concave spaces by moving the nozzle head along the substrate while causing the nozzle head to eject the ink, and

the presence of an ink dropping point in each of the first space and the second space is ensured by adjusting a position of the nozzle head in a direction along the substrate that is perpendicular to the direction in which the nozzle head is moved.

11. The method of claim 1, wherein

an organic light-emitting layer is one type of the organic functional layer.

12. An organic EL display device comprising:

a substrate;

banks over the substrate, the banks partitioning a plurality of concave spaces from one another;

an organic functional layer in each of the concave spaces; and

in each of adjacent concave spaces, among the plurality of concave spaces, between which a bank having a bank defect portion is located, one or more dams partitioning the organic functional layer in the concave space into a first organic functional layer in a vicinity of the bank defect portion and a second organic functional layer not in the vicinity of the bank defect portion.