HIGH RESOLUTION LOW POWER CONSUMPTION OLED DISPLAY WITH EXTENDED LIFETIME

• US 20140203244A1
• Filed: 01/18/2013
• Published: 07/24/2014
• Est. Priority Date: 01/18/2013
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Michael Hack, Michael Stuart Weaver, Xu Xin
• Inventors: HACK, Michael, WEAVER, Michael Stuart, XU, Xin
• Granted Patent: US 9,385,168 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• 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 50/80 Constructional details
• 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]

Abstract

Arrangements of pixel components that allow for full-color devices, while using emissive devices that emit at not more than two colors, and/or a 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 full-color pixel arrangement for an OLED device comprising:

a plurality of sub-pixels, each sub-pixel comprising an emissive region;

wherein the arrangement comprises emissive regions of not more than two colors, and the pixel arrangement comprises not more than two color altering layers.

2. The pixel arrangement of claim 1, said plurality of sub-pixels further comprising:

a first sub-pixel comprising a first emissive region configured to emit a first color; and

a second sub-pixel comprising;

a second emissive region configured to emit a second color; and

a first color altering layer disposed in a stack with the second emissive region.

3. The arrangement of claim 2, further comprising:

a third sub-pixel comprising a third emissive region configured to emit the second color.

4. The arrangement of claim 3, wherein the third sub-pixel further comprises:

a second color altering layer disposed in a stack with the third emissive region.

5. The arrangement of claim 3, wherein the first sub-pixel has an area not less than the combined area of the second sub-pixel and the third sub-pixel.

6. The arrangement of claim 2, wherein the second sub-pixel has a larger area than the first sub-pixel.

7. The arrangement of claim 2, wherein the first emissive region comprises a stacked emissive device.

8. The arrangement of claim 2, wherein the second emissive region comprises a stacked emissive device.

9. The arrangement of claim 2, wherein the second emissive region comprises:

a first emissive material having an emission spectrum of a third color; and

a second emissive material having an emission spectrum of a fourth color;

wherein each of the third and fourth colors are different from each of the first and second colors.

10. The arrangement of claim 1, wherein the first sub-pixel comprises a phosphorescent emissive material.

11. The arrangement of claim 1, wherein the first sub-pixel comprises a fluorescent emissive material.

12. The arrangement of claim 1, wherein the first color altering layer comprises a color conversion layer.

13. The arrangement of claim 1, wherein the first color altering layer comprises a color filter.

14. The arrangement of claim 1, further comprising a downconversion filter disposed in a stack with the second sub-pixel.

15. The arrangement of claim 1, wherein the first color altering layer comprises a band-pass filter.

16. The arrangement of claim 1, wherein the first color altering layer comprises a cut-off filter.

17. An OLED device comprising the pixel arrangement of claim 1.

18. A device as recited in claim 17, wherein the device is a type selected from the group consisting of:

a flat panel display, a smartphone, a transparent display, a flexible display, a television, a portable device, a multimedia device, and an illumination device.

19. A device as recited in claim 17, wherein the OLED device is a display having a resolution of at least 250 dpi.

20. The arrangement of claim 1, further comprising a plastic substrate.

21. An active matrix OLED device comprising the pixel arrangement as recited in claim 1.

22. A flexible OLED device comprising the pixel arrangement as recited in claim 1.

23. A full-color pixel arrangement for an OLED device comprising:

a plurality of sub-pixels comprising;

a first sub-pixel comprising an emissive region configured to emit blue light; and

a second sub-pixel comprising an emissive region configured to emit yellow light;

wherein the pixel arrangement comprises emissive regions of not more than two colors, and the pixel arrangement comprises not more than two color altering layers.

24. The arrangement of claim 23, further comprising:

a first color altering layer disposed in a stack with the second emissive region.

25. The arrangement of claim 24, wherein the first color altering layer comprises a band-pass filter.

26. The arrangement of claim 24, wherein the first color altering layer comprises a cut-off filter.

27. The arrangement of claim 24, wherein the first color altering layer converts light emitted by the second emissive region to a color selected from the group consisting of:

green and red.

28. The arrangement of claim 27, said plurality of sub-pixels further comprising a third sub-pixel comprising an emissive region configured to emit yellow light, wherein the third sub-pixel is unfiltered.

29. The arrangement of claim 27, further comprising:

a third sub-pixel comprising an emissive region configured to emit blue light; and

a second color altering layer disposed in a stack with the third emissive region, the second color altering layer configured to convert light emitted by the third emissive region to deep blue light;

wherein the first emissive region and the third emissive region are configured to emit light blue light.

30. The arrangement of claim 23, wherein the yellow light emitted by the second sub-pixel has CIE coordinates that lie outside the RG line on the 1931 CIE diagram.

31. A full-color pixel arrangement for an OLED device comprising:

a first sub-pixel comprising a first emissive region configured to emit a first color;

a second sub-pixel comprising a second emissive region configured to emit a second color;

a third sub-pixel comprising a third emissive region configured to emit the second color;

a first color altering layer disposed in a stack with the second emissive region; and

a second color altering layer disposed in a stack with the third emissive region.

32. The arrangement of claim 31, further comprising:

a fourth sub-pixel comprising an emissive region configured to emit the second color.

33. The arrangement of claim 32, further comprising:

a third color altering layer disposed in a stack with the fourth emissive region.

34. The arrangement of claim 31, further comprising:

a fourth sub-pixel comprising a fourth emissive region configured to emit the second color.

35. The arrangement of claim 34, further comprising:

a third color altering layer disposed in a stack with the fourth emissive region.

36. The arrangement of claim 31, further comprising:

a downconversion filter disposed in a stack with the third emissive region.

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

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

depositing a second emissive material through a 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 portion of the second emissive material.

38. The method of claim 37, wherein the full-color OLED pixel arrangement is fabricated using no more than two masking steps.