HYBRID DISPLAY

• US 20180166512A1
• Filed: 11/14/2017
• Published: 06/14/2018
• Est. Priority Date: 09/18/2015
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: HACK, Michael, WEAVER, Michael Stuart, MAYWEATHER, III, William T., BROWN, Julia J., THOMPSON, Nicholas J.
• Granted Patent: US 10,263,050 B2
• Time in Patent Office: Days
• CPC Class Codes: H01L 33/00 Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof H10K50/00 takes precedence; devices consisting of a plurality of semiconductor components formed in or on a common substrate and including semiconductor components having potential barriers, specially adapted for light emission H01L27/15; semiconductor lasers H01S5/00
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
• 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 59/70 OLEDs integrated with inorganic light-emitting elements, e.g. with inorganic electroluminescent elements

Abstract

A hybrid pixel arrangement for a full-color display is provided, which includes an inorganic LED in at least one sub-pixel, and an organic emissive stack in at least one other sub-pixel. In an embodiment, a first sub-pixel is configured to emit a first color, and includes an inorganic LED, a second sub-pixel is configured to emit a second color, and includes a first organic emissive stack configured to emit an initial color different from the first color. A third sub-pixel is configured to emit a third color different from the initial color.

Claims

1. A pixel arrangement for a full-color display, the arrangement comprising:

a first sub-pixel configured to emit a first color, the first sub-pixel comprising an inorganic light-emitting diode (LED);

a second sub-pixel configured to emit a second color, the second sub-pixel comprising a first portion of a first organic emissive stack configured to emit an initial color different from the first color; and

a single data driver configured to provide luminance information to each of the first sub-pixel and the second sub-pixel.

2. The pixel arrangement of claim 1, wherein the second sub-pixel comprises a green OLED having first CIE coordinates, and further comprising:

a third sub-pixel comprising red OLED having second CIE coordinates; and

a fourth sub-pixel comprising a yellow OLED having third CIE coordinates;

wherein the third CIE coordinates lie to the right of a line between the first CIE coordinates and the second CIE coordinates on the 1931 CIE color chart.

3. The pixel arrangement of claim 1, wherein the data driver provides a voltage V_dd corresponding to a required overall luminance for the first sub-pixel.

4. The pixel arrangement of claim 3, wherein the voltage is converted into a time for which the LED is driven at a constant current.

5. The pixel arrangement of claim 4, wherein the constant current I is set by a resistor having resistance R and a driver saturation voltage V_sat such that I=(V_dd−

V_sat−

V_LED)/R.

6. A hybrid display comprising a plurality of pixels, each of the plurality of pixels comprising:

an inorganic blue LED;

a green OLED having first CIE coordinates;

a red OLED having second CIE coordinates; and

a yellow OLED having CIE coordinates that lie to the right of a line between the first CIE coordinates and the second CIE coordinates on the 1931 CIE color chart.

7. The hybrid display of claim 6, wherein the yellow OLED has a dominant spectral distribution in the range of 550 nm-580 nm.

8. The hybrid display of claim 7, wherein the green OLED has a dominant spectral distribution in the range of 510 nm-525 nm.

9. The hybrid display of claim 8, wherein the blue LED has a dominant spectral distribution in the range of 450 nm-455 nm.

10. The hybrid display of claim 8, wherein the red OLED has a dominant spectral distribution in the range of 620 nm-625 nm.

11. -18. (canceled)

19. A hybrid display having a display resolution, the display comprising:

a substrate; and

a plurality of pixels disposed over the substrate, each of the plurality of pixels comprising;

a red sub-pixel having a red organic emissive layer;

a green sub-pixel having a green organic emissive layer and disposed adjacent to, and non-overlapping with, the red emissive layer; and

an inorganic blue LED sub-pixel disposed in a plane above or below the red and green sub-pixels.

20. The hybrid display of claim 19, wherein the red and green emissive layers are arranged in a geometry corresponding to a deposition mask having a resolution of not more than one-half of the display resolution.

21. The hybrid display of claim 19, wherein each blue LED sub-pixel is shared among multiple pixels of the plurality of pixels.

22. The hybrid display of claim 21, wherein each blue LED sub-pixel is shared among up to 64 pixels of the plurality of pixels.