ORGANIC LIGHT EMITTING DEVICE AND METHOD FOR MANUFACTURING SAME

• US 20170117339A1
• Filed: 04/03/2015
• Published: 04/27/2017
• Est. Priority Date: 04/08/2014
• Status: Active Grant

• Current Assignee: JDI Design and Development GK
• Original Assignee: JOLED Inc.
• Inventors: TAKATA, Masakazu
• Granted Patent: US 9,997,575 B2
• Time in Patent Office: Days
• CPC Class Codes: H05B 33/145 Arrangements of the electroluminescent material
• CPC Class Codes: H10K 50/00 Organic light-emitting devices integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 71/12 using liquid deposition, e.g. spin coating

Abstract

An organic light emitting device including: a base substrate; column banks extending in one direction along a surface of the base substrate; and light emitting elements extending along the one direction in groove regions defined by the column banks, wherein each of the light emitting elements has one or more functional layers sandwiched between a pair of electrodes, and within at least one of the groove regions: a sub-bank extends along the one direction and has a height equal to or smaller than a height of the column banks, and for each of the one or more functional layers therein, portions thereof on either side of the sub-bank are made of the same material.

Claims

1. An organic light emitting device comprising:

a base substrate;

a plurality of column banks extending in one direction along a surface of the base substrate; and

a plurality of light emitting elements extending along the one direction in a plurality of groove regions defined by the plurality of column banks,

wherein

each of the light emitting elements has one or more functional layers sandwiched between a pair of electrodes,

within at least one of the groove regions;

a sub-bank extends along the one direction and has a height equal to or smaller than a height of the column banks, and

for each of the one or more functional layers therein, portions thereof on either side of the sub-bank are made of the same material.

2. The organic light emitting device according to claim 1, wherein

the sub-bank is continuous from one end to another end of each light emitting element along the one direction.

3. The organic light emitting device according to claim 1, wherein

an upper end of the sub-bank is closer to the surface of the base substrate than an upper end of each of the column banks.

4. The organic light emitting device according to claim 1, wherein

a plurality of row banks are in each of the groove regions, partitioning functional layers of light emitting elements that are adjacent to each other in the one direction.

5. The organic light emitting device according to claim 4, wherein

an upper end of each of the row banks is closer to the surface of the base substrate than the upper end of each of the column banks.

6. The organic light emitting device according to claim 1, wherein

a pixel electrode is disposed on the base substrate under the one or more functional layers of each of the light emitting elements, and

each pixel electrode disposed under the one or more functional layers in the at least one of the groove regions in which the sub-bank is present spans the portions of the one or more functional layers therein.

7. The organic light emitting device according to claim 1, wherein

each of the at least one of the groove regions in which the sub-bank is present has a groove width of 80 μ

m or more, and

each portion of the at least one of the groove regions on either side of the sub-bank has a width of 80 μ

m or less.

8. The organic light emitting device according to claim 1, wherein

the plurality of groove regions has small and large groove widths, and

the sub-bank is disposed at least in a groove region having the largest groove width among the groove widths.

9. The organic light emitting device according to claim 1, wherein

a thickness of the one or more functional layers is smaller than a height of the sub-bank.

10. A method for forming a functional layer by preparing a bank-formed substrate that includes a base substrate and a plurality of banks extending in one direction along a surface of the base substrate, applying ink for forming a functional layer of a light emitting element to each of a plurality of groove regions defined by the plurality of banks in the bank-formed substrate, and drying the ink,

the method comprising:

prior to the application of the ink to the bank-formed substrate,

forming one or more sub-banks extending along the one direction, in at least one of the plurality of groove regions; and

in applying the ink to the at least one of the groove regions in which the sub-bank is formed, applying the ink to either side of the sub-bank.

11. The method according to claim 10, wherein

the sub-bank has a lower liquid-repelling property against the ink for forming the functional layer than the bank.

12. The method according to claim 10, wherein

in applying the ink to the at least one of the groove regions in which the sub-bank is formed, the ink is applied covering the sub-bank.

13. A method for manufacturing an organic light emitting device by forming a functional layer on a base substrate,

the method comprising:

implementing the method according to claim 10, in forming the functional layer.