OLED Display Architecture with Improved Aperture Ratio

• US 20110127506A1
• Filed: 11/24/2010
• Published: 06/02/2011
• Est. Priority Date: 12/02/2009
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: So, Woo-Young
• Granted Patent: US 8,330,152 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• 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]

Abstract

A device such as a display region that includes a plurality of multi-color pixels is provided. Each pixel may have several types of organic light emitting devices that operate as sub-pixels, and at least one type of device may be shared by multiple pixels. Less-used and/or more efficient device types, such as deep blue and green light emitting devices, may be shared between multiple pixels, leading to an improved aperture ratio and fill factor for the device.

Claims

1. A region of a display having a plurality of independently-addressable pixels, each pixel capable of emitting a spectrum comprising:

a red component having a peak wavelength in the visible spectrum of 580-700 nm;

a green component having a peak wavelength in the visible spectrum of 500-600 nm;

a light blue component having a peak wavelength in the visible spectrum of 400-500 nm; and

a deep blue component having a peak wavelength in the visible spectrum of 400-500 nm and at least 4 nm less than the peak wavelength of the light blue component;

wherein a first of the plurality of pixels and a second of the plurality of pixels share at least one organic light emitting device; and

wherein the first pixel comprises;

a first red-emitting organic light emitting device configured to emit light having a peak wavelength in the visible spectrum of 580-700 nm,

a first green-emitting organic light emitting device configured to emit light having a peak wavelength in the visible spectrum of 500-600 nm;

a first light blue-emitting organic light emitting device configured to emit light having a peak wavelength in the visible spectrum of 400-500 nm;

a first deep blue-emitting organic light emitting device configured to emit light having a peak wavelength in the visible spectrum of 400-500 nm and at least 4 nm less than the peak wavelength of the first light blue organic light emitting device.

2. The display region of claim 1, wherein the second pixel comprises:

a second red-emitting organic light emitting device configured to emit light having a peak wavelength in the visible spectrum of 580-700 nm;

a second green-emitting organic light emitting device configured to emit light having a peak wavelength in the visible spectrum of 500-600 nm;

a second light blue-emitting organic light emitting device configured to emit light having a peak wavelength in the visible spectrum of 400-500 nm; and

the first deep blue-emitting organic light emitting device.

3. The display region of claim 1, wherein the second pixel comprises:

a second red-emitting organic light emitting device configured to emit light having a peak wavelength in the visible spectrum of 580-700 nm;

the first green-emitting organic light emitting device;

a second light blue-emitting organic light emitting device configured to emit light having a peak wavelength in the visible spectrum of 400-500 nm; and

the first deep blue-emitting organic light emitting device.

4. The display region of claim 1, wherein the region contains exactly four types of devices, and at least one type of device comprises less than 25% of the total number of devices in the region.

5. The display region of claim 4, wherein the one of the types of devices comprises at most about 17% of the total number of devices in the region.

6. The display region of claim 5, wherein the one of the types of devices comprises at most about 15% of the total number of devices in the region.

7. The display region of claim 4, wherein the region includes at least 100 individually-addressable pixels.

8. The display region of claim 1, wherein the organic light emitting devices are arranged in a delta pattern.

9. The display region of claim 1, wherein no light blue-emitting organic light emitting device in the region is immediately adjacent to a deep blue-emitting organic light emitting device.

10. The display region of claim 1, wherein at least one light blue-emitting organic light emitting device in the region is immediately adjacent to a deep blue-emitting organic light emitting device.

11. The display region of claim 1, wherein each light blue-emitting organic light emitting device emits light having a peak wavelength in the visible spectrum of 465-500 nm.

12. The display region of claim 1, wherein each deep blue-emitting organic light emitting device emits light having a peak wavelength in the visible spectrum of 400-465 nm.

13. The display region of claim 1, wherein each light blue-emitting organic light emitting device emits light having a CIE x-coordinate less than 0.2 and a CIE y-coordinate of less than 0.5.

14. The display region of claim 13, wherein each deep blue-emitting organic light emitting device emits light having a CIE y-coordinate of less than 0.15.

15. The display region of claim 14, wherein the CIE coordinates of light emitted each light blue-emitting organic light emitting device and the CIE coordinates of light emitted by each deep blue-emitting 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.

16. The display region of claim 1, wherein the first red-emitting, green-emitting, and light blue-emitting organic light emitting devices are disposed in a triangular arrangement.

17. The display region of claim 1, wherein the first deep-blue, and the second red-emitting and green-emitting organic light emitting devices are disposed in a triangular arrangement.

18. The display region of claim 1, wherein the organic first red-emitting, green-emitting, light blue-emitting, and deep blue-emitting light emitting devices are arranged in a row.

19. The display region of claim 1, wherein the at least one of the first red-emitting, green-emitting, light blue-emitting, and deep blue-emitting organic light emitting device comprises an emissive layer having a fluorescent emissive material

20. The display region of claim 1, wherein the at least one of the first red-emitting, green-emitting, light blue-emitting, and deep blue-emitting organic light emitting device comprises an emissive layer having a phosphorescent emissive material.

21. A full-color display comprising the display region of claim 1.

22. A consumer product comprising the display region of claim 1.