Broadband light tandem OLED display

• US 20070001588A1
• Filed: 06/29/2005
• Published: 01/04/2007
• Est. Priority Date: 06/29/2005
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Eastman Kodak Company
• Inventors: Spindler, Jeffrey, Hatwar, Tukaram, Boroson, Michael
• Granted Patent: US 7,564,182 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

A tandem OLED display for producing broadband light having at least two spaced electrodes includes two or more broadband light-emitting units disposed between the electrodes, at least two of which produce light having different emission spectra and wherein at least one of such broadband light-emitting units does not produce white light, and an intermediate connector disposed between adjacent light-emitting units.

Claims

1. A tandem OLED display for producing broadband light having at least two spaced electrodes comprising:

a) two or more broadband light-emitting units disposed between the electrodes, at least two of which produce light having different emission spectra and wherein at least one of such broadband light-emitting units does not produce white light; and

b) an intermediate connector disposed between adjacent light-emitting units.

2. The tandem OLED display of claim 1 wherein one of the broadband light-emitting units produces white light and the other produces green and blue light.

3. The tandem OLED display of claim 1 wherein one of the broadband light-emitting units produces white light and the other produces red and blue light.

4. The tandem OLED display of claim 1 wherein one of the broadband light-emitting units produces white light and the other produces red and green light.

5. The tandem OLED display of claim 1 wherein none of the broadband light-emitting units individually produce white light.

6. The tandem OLED display of claim 5 wherein the combined emissions of the broadband light-emitting units form white light.

7. The tandem OLED display of claim 1 wherein at least one of the broadband light-emitting units produces an emission spectrum with a first and a second emission peak, wherein the first emission peak has a greater intensity than the second emission peak.

8. The tandem OLED display of claim 7 wherein each of the broadband light-emitting units produces an emission spectrum with a first and a second emission peak, wherein the first emission peak has a greater intensity than the second emission peak, and wherein the first emission peaks of the broadband light-emitting units are selected so that the combined emission produces white light.

9. The tandem OLED display of claim 1 further including one or more color change modules.

10. The tandem OLED display of claim 9 further including at least three different colored gamut pixels.

11. The tandem OLED display of claim 10 further including at least one within-gamut pixel.

12. The tandem OLED display of claim 1 further including one or more color filters.

13. The tandem OLED display of claim 12 further including at least three different colored gamut pixels.

14. The tandem OLED display of claim 13 further including at least one within-gamut pixel.