High resolution low power consumption OLED display with extended lifetime

• US 10,374,017 B2
• Filed: 12/08/2016
• Issued: 08/06/2019
• Est. Priority Date: 01/18/2013
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: Hack, Michael, Weaver, Michael Stuart, Brown, Julia J., Xu, Xin
• Primary Examiner(s): Rahman, Moin M
• Application Number:
  US15/373,090
• Publication Number:
  US 20170092699A1
• Time in Patent Office: 971 Days
• Field of Search: 257 13, 257 79-103, 257918, 257 40, 257642-643, 257759, 438 22- 47, 438 69, 438493, 438503, 438507, 438956
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/321 Inverted OLED, i.e. having cathode between substrate and anode
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/166 using selective deposition, e.g. using a mask

Abstract

Arrangements of pixel components that allow for full-color devices, while using emissive devices that use blue color altering layers in conjunction with blue emissive regions, that emit at not more than two colors, and/or that use limited number of color altering layers, are provided. Devices disclosed herein also may be achieved using simplified fabrication techniques compared to conventional side-by-side arrangements, because fewer masking steps may be required.

Claims

1. A method of fabricating a full-color OLED pixel arrangement, said method comprising:

depositing a first emissive material through a first pixel mask over a substrate;

depositing a second emissive material through a second pixel mask over the substrate, the second emissive material configured to emit a different color than the first emissive material; and

disposing a first color altering layer in a stack with a first portion of the second emissive material;

wherein all emissive materials in the full-color OLED pixel arrangement are deposited using no more than two depositions of emissive material through one or more physical masks.

2. The method of claim 1, wherein the full-color OLED pixel arrangement is fabricated using no more than two depositions of emissive material through one or more physical masks.

3. The method of claim 1, wherein a plurality of openings in the second pixel mask have an area of about half the emissive area of a pixel of the full-color OLED pixel arrangement.

4. The method of claim 1, further comprising:

disposing a second color altering layer in a stack with a second portion of the second emissive material.

5. The method of claim 1, wherein the first emissive material has an area over the substrate not less than the combined area of the first and second portions of the second emissive material.

6. The method of claim 1, wherein the first emissive material comprises a phosphorescent emissive material.

7. The method of claim 1, wherein the first emissive material comprises a fluorescent emissive material.

8. The method of claim 1, wherein the first color altering layer comprises at least one selected from the group consisting of:

a color conversion layer, a color filter, a band-pass filter, and a cut-off filter.

9. The method of claim 1, wherein the first emissive material is a blue-emitting emissive material.

10. The method of claim 1, wherein the second emissive material is a yellow-emitting emissive material.

11. The method of claim 10, wherein at least a portion of the second emissive region is left unfiltered.

12. The method of claim 1, wherein the second pixel mask is the same as, or has the same physical arrangement as, the first pixel mask.