HIGH RESOLUTION LOW POWER CONSUMPTION OLED DISPLAY WITH EXTENDED LIFETIME

• US 20170207281A1
• Filed: 04/05/2017
• Published: 07/20/2017
• Est. Priority Date: 01/18/2013
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: Hack, Michael, Adamovich, Vadim, Thompson, Nicholas J., Weaver, Michael Stuart
• Granted Patent: US 10,304,906 B2
• Time in Patent Office: Days
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• 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 59/353 characterised by the geometrical arrangement of the RGB subpixels
• 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

Abstract

Full-color pixel arrangements for use in devices such as OLED displays are provided, in which multiple sub-pixels are configured to emit different colors of light, with each sub-pixel having a different optical path length than some or all of the other sub-pixels within the pixel.

Claims

1. A full-color pixel arrangement for an OLED device, the full-color pixel arrangement comprising:

a first sub-pixel comprising an emissive region of a first color and having a first optical path length;

a second sub-pixel comprising an emissive region of the first color, the second sub-pixel having a second optical path length different than the first optical path length;

a third sub-pixel comprising an emissive region of a second color;

wherein the full-color pixel arrangement comprises emissive regions of exactly two different colors.

2. The full-color pixel arrangement of claim 1, further comprising:

a fourth sub-pixel comprising an emissive region of the first color, the fourth sub-pixel having a third optical path length different than the first optical path length.

3. The full-color pixel arrangement of claim 2, wherein the third optical path length is different than the second optical path length.

4. The full-color pixel arrangement of claim 1, wherein the full-color pixel arrangement comprises N total sub-pixels comprising an emissive region of the first color, and at least one pixel further comprises 0 to N−

1 color altering layers.

5. The full-color pixel arrangement of claim 4, wherein the full-color pixel arrangement comprises N+1 total sub-pixels.

6. The full-color pixel arrangement of claim 5, wherein the at full-color pixel arrangement comprises N+2 total sub-pixels.

7. The full-color pixel arrangement of claim 1, wherein the full-color pixel arrangement comprises zero color altering layers.

8. The full-color pixel arrangement of claim 1, wherein each emissive region of the first color comprises a plurality of emissive materials disposed within a single emissive layer.

9. The full-color pixel arrangement of claim 8, wherein the single emissive layer comprises

a first emissive material of a third color;

and

a second emissive material of a fourth color;

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

10. The full-color pixel arrangement of claim 1, wherein the first sub-pixel comprises a first bottom electrode having a first thickness, and the second sub-pixel comprises a second bottom electrode having a second thickness different than the first thickness.

11. The full-color pixel arrangement of claim 1, wherein the first emissive region has a first thickness, and the second emissive region has a second thickness different than the first thickness.

12. The full-color pixel arrangement of claim 1, further comprising a color altering layer disposed in a stack with the first sub-pixel.

13. An OLED device comprising the full-color pixel arrangement of claim 1.

14. The OLED device of claim 13, wherein the OLED device is a display having a resolution of at least 250 dpi.

15. The OLED device of claim 13, wherein the device is a type selected from the group consisting of:

a wearable device, 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 3D 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.

16. A method of fabricating a full-color pixel arrangement for an OLED device, the method comprising:

fabricating a patterned layer having a pattern over a first area of a substrate, the pattern defining at least two sub-pixel regions over the substrate;

depositing a first emissive material over the at least two sub-pixel regions;

depositing a second emissive material over a second area of the substrate, wherein the second area does not overlap the first area;

fabricating an electrode layer over the first emissive material and the second emissive material;

wherein the at least two sub-pixel regions have different optical path lengths between the substrate and the electrode layer.

17. The method of claim 16, wherein the patterned layer is a layer deposited over an electrode layer disposed over the substrate and below the patterned layer.

18. The method of claim 16, wherein the patterned layer is an electrode layer.

19. The method of claim 16, wherein the step of fabricating the patterned layer comprises patterning an electrode layer disposed over the substrate.

20. The method of claim 19, wherein the step of patterning the electrode layer comprises a photolithographic technique.