NOVEL OLED DISPLAY ARCHITECTURE

• US 20100090620A1
• Filed: 09/23/2009
• Published: 04/15/2010
• Est. Priority Date: 10/01/2008
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: WEAVER, Michael S., BROWN, Julia J., D'ANDRADE, Brian, HACK, Michael
• Granted Patent: US 9,385,167 B2
• Time in Patent Office: Days
• US Class Current: 315/312
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• 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

Abstract

A device that may be used as a multi-color pixel is provided. The device has a first organic light emitting device, a second organic light emitting device, a third organic light emitting device, and a fourth organic light emitting device. The device may be a pixel of a display having four sub-pixels. The first device may emit red light, the second device may emit green light, the third device may emit light blue light and the fourth device may emit deep blue light.

Claims

1. A device, comprising:

a first organic light emitting device that emits light having a peak wavelength in the visible spectrum of 600-700 nm, further comprising a first emissive layer having a first emissive material, wherein the first emissive material is phosphorescent;

a second organic light emitting device that emits light having a peak wavelength in the visible spectrum of 500-600 nm, further comprising a second emissive layer having a second emissive material, wherein the second emissive material is phosphorescent;

a third organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400-500 nm, further comprising a third emissive layer having a third emissive material, wherein the third emissive material is phosphorescent; and

a fourth organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400 to 500 nm, further comprising a fourth emissive layer having a fourth emissive material;

wherein the peak wavelength in the visible spectrum of light emitted by the fourth organic light emitting device is at least 4 nm less than the peak wavelength in the visible spectrum of light emitted by the third organic light emitting device.

2. The device of claim 1, wherein

the third organic light emitting device emits light having a peak wavelength in the visible spectrum of 470-500 nm;

and

the fourth organic light emitting device emits light having a peak wavelength in the visible spectrum of 400 to 470 nm.

3. The device of claim 2, wherein:

the third organic light emitting device emits light having a CIE x-coordinate less than 0.2 and a CIE y-coordinate less than 0.5, and

the fourth the organic light emitting device emits light having a CIE y-coordinate less than 0.15.

4. The device of claim 3, wherein the CIE coordinates of light emitted by the third organic light emitting device and the CIE coordinates of light emitted by the fourth organic light emitting device are sufficiently different that the difference in the CIE x-coordinates plus the difference in the CIE y-coordinates is at least >

0.01.

5. The device of claim 2, wherein the fourth emissive material is fluorescent.

6. The device of claim 2, wherein the fourth emissive material is phosphorescent.

7. The device of claim 2, wherein each of the first, second, third and fourth organic light emitting devices have the same surface area.

8. The device of claim 2, wherein at least one of the first, second, third and fourth organic light emitting devices has a surface area different from another of the first, second, third and fourth organic light emitting devices.

9. The device of claim 2, wherein the device is part of a full color display.

10. The device of claim 2, wherein the first, second, third and fourth organic light emitting devices are arranged in a quad pattern.

11. The device of claim 2, wherein the first, second, third and fourth organic light emitting devices are arranged in a row.

12. The device of claim 2, wherein the emissive material of the third and fourth organic light emitting devices is the same material, and the fourth organic light emitting device includes a microcavity.

13. The device of claim 1, wherein the device is a consumer product.

14. A device, comprising:

a first organic light emitting device that emits light having a peak wavelength in the visible spectrum of 600-700 nm, further comprising a first emissive layer having a first emissive material, wherein the first emissive material is phosphorescent;

a second organic light emitting device that emits light having a peak wavelength in the visible spectrum of 500-600 nm, further comprising a second emissive layer having a second emissive material, wherein the second emissive material is phosphorescent;

a third organic light emitting device that emits light having a CIE y coordinate less than 0.25, further comprising a third emissive layer having a third emissive material, wherein the third emissive material is phosphorescent; and

a fourth organic light emitting device that emits light having a CIE y coordinate at least 0.02 less than that of light emitted by the third organic light emitting device, further comprising a fourth emissive layer having a fourth emissive material.

15. A method of operating a device having first, second, third and fourth organic light emitting devices such that the device emits light having a desired CIE coordinate, wherein

the first organic light emitting device emits light having a peak wavelength in the visible spectrum of 600-700 nm, and further comprises a first emissive layer having a first emissive material, wherein the first emissive material is phosphorescent;

the second organic light emitting device that emits light having a peak wavelength in the visible spectrum of 500-600 nm, and further comprises a second emissive layer having a second emissive material, wherein the second emissive material is phosphorescent;

the third organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400-500 nm, and further comprises a third emissive layer having a third emissive material, wherein the third emissive material is phosphorescent;

the fourth organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400 to 500 nm, and further comprises a fourth emissive layer having a fourth emissive material;

the peak wavelength in the visible spectrum of light emitted by the fourth organic light emitting device is at least 4 nm less than the peak wavelength in the visible spectrum of light emitted by the third organic light emitting device;

the CIE coordinates of light emitted by the first, second and third devices define a first triangle in the CIE space;

the CIE coordinates of light emitted by the first, third and fourth devices define a second triangle in the CIE space;

the CIE coordinates of light emitted by the second, third and fourth devices define a third triangle in the CIE space;

the method comprising;

emitting light from the first, second and third devices, but not the fourth device, to achieve emission of light with the desired CIE coordinates, if the desired CIE coordinates fall within the first triangle;

emitting light from the first, third and fourth devices, but not the second device, to achieve emission of light with the desired CIE coordinates, if the desired CIE coordinates fall within the second triangle;

emitting light from the second, third and fourth devices, but not the first device, to achieve emission of light with the desired CIE coordinates, if the desired CIE coordinates fall within the third triangle.

16. The method of claim 15, wherein

the third organic light emitting device emits light having a peak wavelength in the visible spectrum of 470-500 nm;

and

the fourth organic light emitting device emits light having a peak wavelength in the visible spectrum of 400 to 470 nm.