High resolution low power consumption OLED display with extended lifetime

• US 10,229,956 B2
• Filed: 01/26/2015
• Issued: 03/12/2019
• 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., So, Woo-Young, Brown, Candice H.
• Primary Examiner(s): Everhart, Caridad
• Application Number:
  US14/605,748
• Publication Number:
  US 20160218150A1
• Time in Patent Office: 1,506 Days
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/30 Devices specially adapted for multicolour light emission
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/352 the areas of the RGB subpixels being different
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

OLED-based devices that include at least two colors of emissive regions are provided, in which one region is optically coupled to a microcavity and the other is not. Devices including pixels in which only a portion of sub-pixels within the pixel are coupled to a microcavity are provided.

Claims

1. A full-color pixel arrangement comprising:

a first organic emissive region configured to emit a first color;

a second organic emissive region disposed adjacent to and not superposed with the first emissive region, and configured to emit a second color different from the first color; and

an electrode superposed with the first and second emissive regions, wherein the distance between a surface of the electrode and the first organic emissive region, measured in a direction normal to the electrode, is different than the distance between the surface of the electrode and the second organic emissive region, measured in the direction normal to the electrode;

wherein at least a first portion of the first organic emissive region is optically coupled to a microcavity, and the second organic emissive region is not optically coupled to a microcavity; and

wherein the first portion of the first emissive region includes less than the entire first emissive region.

2. The pixel arrangement of claim 1, wherein the pixel arrangement comprises emissive regions of not more than two colors.

3. The pixel arrangement of claim 1, wherein the pixel arrangement comprises not more than two color altering layers.

4. The pixel arrangement of claim 1, wherein a second portion of the first emissive region less than the entire first emissive region and separate from the first portion of the first emissive region is optically coupled to the microcavity.

5. A device comprising the full-color pixel arrangement of claim 1, wherein the device is a type selected from the group consisting of:

a flat panel display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination, a signal, a color tunable or color temperature tunable lighting source, a heads-up display, a fully transparent display, a flexible display, a laser printer, a telephone, a cell phone, a personal digital assistant (PDA), a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display, a vehicle, a large area wall, a theater or stadium screen, and a sign.

6. The pixel arrangement of claim 1, wherein the second organic emissive region emits light having 1931 CIE (x, y) coordinates that lie within (+/−

0.02, +/−

0.02) of points on a straight line between 1931 CIE coordinates of light emitted by the first organic emissive region and 1931 CIE coordinates of a selected white point.

7. The pixel arrangement of claim 6, wherein the color shift in 1931 CIE (x, y) coordinates of the white point is less than (0.01, 0.01) for viewing angles between 0°

and 60°

inclusive.

8. A full-color OLED display having a color shift in 1931 CIE (x, y) coordinates of the white point of less than (0.02, 0.02) for viewing angles between 0°

and 60°

inclusive, wherein at least one pixel of the full-color OLED comprises;

a first organic emissive region configured to emit a first color;

a second organic emissive region disposed adjacent to and not superposed with the first emissive region, and configured to emit a second color different from the first color; and

an electrode superposed with the first and second emissive regions, wherein the distance between a surface of the electrode and the first organic emissive region, measured in a direction normal to the electrode, is different than the distance between the surface of the electrode and the second organic emissive region, measured in the direction normal to the electrode;

wherein at least a first portion of the first organic emissive region is optically coupled to a microcavity, and the second organic emissive region is not optically coupled to a microcavity.

9. The display of claim 8, wherein each of the plurality of pixels comprises emissive regions of not more than two colors.

10. The display of claim 9, wherein each of the plurality of pixels comprises not more than one microcavity.

11. A full-color pixel arrangement comprising:

a first emissive layer of a first color;

a second emissive layer of a second color, the second emissive layer superposed with only a portion of the first emissive layer less than the entire first emissive layer;

an electrode or a passivation layer disposed between the first emissive layer and the second emissive layer in a plane between the layers; and

a first color altering layer of a first color superposed with a first portion of the second emissive layer and not superposed with the first emissive layer;

wherein the arrangement comprises emissive layers of exactly two colors, and the arrangement emits light of at least four colors.

12. The pixel arrangement of claim 11, a second color altering layer of a second color superposed with a second portion of the second emissive layer and non-overlapping with the first color altering layer.

13. The pixel arrangement of claim 11, wherein the first emissive layer is also a hole transport layer for the second emissive layer.

14. A full-color pixel arrangement comprising:

a first organic emissive region configured to emit a first color;

a second organic emissive region disposed adjacent to and not superposed with the first emissive region, and configured to emit a second color different from the first color; and

an electrode superposed with the first and second emissive regions, wherein the distance between a surface of the electrode and the first organic emissive region, measured in a direction normal to the electrode, is different than the distance between the surface of the electrode and the second organic emissive region, measured in the direction normal to the electrode;

wherein at least a first portion of the first organic emissive region is optically coupled to a microcavity, and the second organic emissive region is not optically coupled to a microcavity;

wherein the first color is light blue, and the microcavity is configured to convert light blue light emitted by the first portion of the first emissive region to deep blue light.

15. The pixel arrangement of claim 14, wherein the first portion of the first emissive region includes less than the entire first emissive region.

16. The pixel arrangement of claim 14, wherein the second organic emissive region emits light having 1931 CIE (x, y) coordinates that lie within (+/−

0.02, +/−

0.02) of points on a straight line between 1931 CIE coordinates of light emitted by the first organic emissive region and 1931 CIE coordinates of a selected white point.

17. The pixel arrangement of claim 14, wherein the pixel arrangement comprises emissive regions of not more than two colors.

18. The pixel arrangement of claim 14, wherein the pixel arrangement comprises not more than two color altering layers.

19. A full-color pixel arrangement comprising:

a first organic emissive region configured to emit a first color;

a second organic emissive region disposed adjacent to and not superposed with the first emissive region, and configured to emit a second color different from the first color; and

an electrode superposed with the first and second emissive regions, wherein the distance between a surface of the electrode and the first organic emissive region, measured in a direction normal to the electrode, is different than the distance between the surface of the electrode and the second organic emissive region, measured in the direction normal to the electrode;

wherein at least a first portion of the first organic emissive region is optically coupled to a microcavity, and the second organic emissive region is not optically coupled to a microcavity; and

wherein the second organic emissive region emits light having 1931 CIE (x, y) coordinates that lie within (+/−

0.02, +/−

0.02) of points on a straight line between 1931 CIE coordinates of light emitted by the first organic emissive region and 1931 CIE coordinates of a selected white point.

20. The pixel arrangement of claim 19, wherein the color shift in 1931 CIE (x, y) coordinates of the white point is less than (0.01, 0.01) for viewing angles between 0°

and 60°

inclusive.

21. The pixel arrangement of claim 19, wherein the pixel arrangement comprises emissive regions of not more than two colors.