Non-common capping layer on an organic device

• US 8,884,316 B2
• Filed: 06/17/2011
• Issued: 11/11/2014
• Est. Priority Date: 06/17/2011
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: Weaver, Michael S., Hack, Michael
• Primary Examiner(s): Montalvo, Eva Y
• Application Number:
  US13/163,132
• Publication Number:
  US 20120319145A1
• Time in Patent Office: 1,243 Days
• Field of Search: 257/40, 257/79, 257/89, 438/28
• US Class Current: 257/89
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/30 Devices specially adapted for multicolour light emission
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

A first method comprises providing a plurality of organic light emitting devices (OLEDs) on a first substrate. Each of the OLEDs includes a transmissive top electrode. The plurality of OLEDs includes a first portion of OLEDs and a second portion of OLEDs that is different from the first portion. The first method further includes depositing a first capping layer over at least the first portion of the plurality of OLEDs such that the first capping layer is optically coupled to at least the first portion of the plurality of OLEDs. A second capping layer is deposited over at least the second portion of the plurality of OLEDs such that the second capping layer is optically coupled to the second portion of the plurality of OLEDs but not the first portion of the plurality of OLEDs.

Claims

1. A method, comprising:

providing a plurality of organic light emitting devices (OLEDs) on a first substrate wherein each OLED includes a transmissive top electrode and wherein the plurality of OLEDs comprises a first portion of OLEDs and a second portion of OLEDs that is different from the first portion;

depositing a first capping layer over at least the first portion of the plurality of OLEDs such that the first capping layer is optically coupled to at least the first portion of the plurality of OLEDs; and

depositing a second capping layer over at least the second portion of the plurality of OLEDs such that the second capping layer is optically coupled to the second portion of the plurality of OLEDs but not the first portion of the plurality of OLEDs, and wherein the second capping layer is deposited through a coarse mask or no mask and is not deposited through a fine metal mask (FMM).

2. The method of claim 1, further comprising depositing the first capping layer over at least the second portion of the plurality of OLEDs such that the first capping layer is optically coupled to the second portion of the plurality of OLEDs.

3. The method of claim 1, wherein the first capping layer is not deposited over the second portion of the plurality of OLEDs such that the first capping layer is not optically coupled to the second portion of the plurality of OLEDs.

4. The method of claim 1, wherein the first capping layer has a first total optical path that is constant over the first portion of the plurality of OLEDs;

wherein the second capping layer has a second total optical path that is constant over the second portion of the plurality of OLEDs; and

wherein the first total optical path and the second total optical path are different.

5. The method of claim 1, wherein depositing the second capping layer comprises at least one of:

laser induced thermal imaging (LITI) or laser induced pattern-wise sublimation (LIPS).

6. The method of claim 1, wherein depositing the second capping layer comprises depositing the second capping layer onto portions of a second substrate and aligning the second capping layer over at least the second portion of the plurality of OLEDs.

7. The method of claim 1, wherein the plurality of OLEDs comprises a plurality of red OLEDs, a plurality of green OLEDs, and a plurality of blue OLEDs.

8. The method of claim 7, wherein the plurality of OLEDs further comprises a third portion of OLEDs that is different from the first and second portions, and wherein the method further comprises the step of depositing a third capping layer over at least the third portion of the plurality of OLEDs such that the third capping layer is optically coupled to at least the third portion of the plurality of OLEDs.

9. The method of claim 8, wherein the third capping layer is not optically coupled to the first portion and the second portion of the plurality of OLEDs.

10. The method of claim 8, wherein the third capping layer is not optically coupled to the first portion or the second potion of the plurality of OLEDs.

11. The method of claim 8, wherein the third capping layer is not deposited through a fine metal mask.

12. The method of claim 8, wherein depositing the third capping layer comprises at least one of:

laser induced thermal imaging (LITI) or laser induced pattern wise sublimation (LIPS).

13. The method of claim 8, wherein depositing the third capping layer comprises depositing the third capping layer onto portions of a second substrate and aligning the third capping layer over the third portion of the plurality of OLEDs.

14. The method of claim 8, wherein the first capping layer has a thickness that is optimized for the plurality of blue OLEDs.

15. The method of claim 14, wherein the second capping layer has a thickness that is optimized for the plurality of red OLEDs and/or the plurality of green OLEDs.

16. The method of claim 15, wherein the third capping layer has a thickness that is optimized for the plurality of red OLEDs and/or the plurality of green OLEDs.

17. The method of claim 1, wherein the first portion of OLEDs and the second portion of OLEDs emit different colors of light from one another in the absence of a filter.

18. The method of claim 1, wherein the first portion of OLEDs and the second portion of OLEDs include different emissive materials from one another.

19. The method of claim 1, Wherein the second capping layer is deposited through a coarse mask.