Method of manufacturing organic light emitting display apparatus and organic light emitting display apparatus

• US 20110127502A1
• Filed: 11/29/2010
• Published: 06/02/2011
• Est. Priority Date: 11/30/2009
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Won-Yong
• Granted Patent: US 8,383,453 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/13 using printing techniques, e.g. ink-jet printing or screen printing

Abstract

A method of manufacturing an organic light emitting display apparatus includes forming first electrodes on a substrate, forming a pixel defining layer (PDL) on the substrate and first electrodes, the PDL including openings exposing predetermined areas of the first electrodes, forming a charge transport layer on the PDL and inside the openings of the PDL, performing a hydrophobic process on the charge transport layer, performing a hydrophilic process on the charge transport layer, such that portions of the charge transport layer corresponding to the openings are made hydrophilic, forming organic light emitting layers on the charge transport layer, and forming a second electrode electrically connected to the organic light emitting layers.

Claims

1. A method of manufacturing an organic light emitting display apparatus, comprising:

forming first electrodes on a substrate;

forming a pixel defining layer (PDL) on the substrate and first electrodes, the PDL including openings exposing predetermined areas of the first electrodes;

forming a charge transport layer on the PDL and inside the openings of the PDL;

performing a hydrophobic process on the charge transport layer;

performing a hydrophilic process on the charge transport layer, such that portions of the charge transport layer corresponding to the openings are made hydrophilic;

forming organic light emitting layers on the charge transport layer; and

forming a second electrode electrically connected to the organic light emitting layers.

2. The method as claimed in claim 1, wherein the organic light emitting layers are formed inside the openings.

3. The method as claimed in claim 1, wherein the charge transport layer includes at least one of a hole transfer layer and a hole injection layer.

4. The method as claimed in claim 1, wherein performing the hydrophobic process includes using plasma or ultraviolet light under an atmosphere of a fluoride-based gas.

5. The method as claimed in claim 4, wherein the fluoride-based gas is CF₄.

6. The method as claimed in claim 1, wherein performing the hydrophilic process includes irradiating ultraviolet light onto regions of the charge transport layer corresponding to the openings.

7. The method as claimed in claim 6, wherein performing the hydrophilic process further comprises use of the ultraviolet light under an atmosphere of air or a nitrogen gas.

8. The method as claimed in claim 7, wherein performing the hydrophilic process further comprises:

providing a mask having transmissive areas respectively corresponding to the openings; and

irradiating the ultraviolet light through the mask using an ultraviolet lamp.

9. The method as claimed in claim 7, wherein irradiating ultraviolet light onto regions of the charge transport layer corresponding to the openings includes using an ultraviolet laser.

10. The method as claimed in claim 9, wherein the hydrophilic process is performed by scanning ultraviolet laser beams focused to sizes corresponding to the openings.

11. The method as claimed in claim 1, wherein performing the hydrophilic process includes making portions of the charge transport layer on bottom and side surfaces of the openings hydrophilic.

12. The method as claimed in claim 1, wherein performing the hydrophilic process includes making only an upper surface of the charge transport layer inside the openings of the PDL hydrophilic.

13. The method as claimed in claim 12, wherein, after the hydrophilic process, a hydrophobic portion of the charge transport layer is defined on an upper surface of the PDL around the openings.

14. The method as claimed in claim 13, wherein a portion of a hydrophilic charge transport layer inside each opening is completely surrounded by a portion of a hydrophobic charge transport layer.

15. The method as claimed in claim 1, wherein the hydrophobic process is performed before the hydrophilic process.

16. The method as claimed in claim 15, wherein:

the hydrophobic process is performed on an entire upper surface of the charge transport layer; and

the hydrophilic process is performed only on portions of the charge transport layer corresponding to the openings.

17. The method as claimed in claim 1, wherein the organic light emitting layers are formed using a nozzle printing method.

18. An organic light emitting display apparatus manufactured by the method of claim 1.