Organic light emitting display

Abstract

An organic light emitting display (OLED) includes a substrate, first and second driving units positioned on the substrate, a first light emitting diode (LED) connected with the first driving unit and including a first organic light emitting layer and a second emitting diode electrically connected with the second driving unit and including a second organic light emitting layer. The second emitting diode is positioned on the first emitting diode.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The implementation of this document will be described in detail Referring to the following drawings in which like numerals refer to like elements.

FIG. 1 is a sectional view showing an organic light emitting display (OLED) according to a first embodiment of this document.

FIG. 2 is a sectional view showing an OLED according to a second embodiment of this document.

FIG. 3 is a sectional view showing an OLED according to a third embodiment of this document.

FIG. 4 is a sectional view showing an OLED according to a fourth embodiment of this document.

Claims

1. An organic light emitting display comprising: a substrate;a first and a second driving units positioned on the substrate; anda first light emitting diode (LED) connected with the first driving unit and comprising a first organic light emitting layer and a second emitting diode electrically connected with the second driving unit and comprising a second organic light emitting layer,wherein the second emitting diode is positioned on the first emitting diode.

2. The display of claim 1, wherein the first emitting diode is a bottom-emission type and the second emitting diode is a top-emission type.

3. The display of claim 1, wherein the first emitting diode comprises a first electrode positioned at a lower portion of the first organic light emitting layer and electrically connected with the first driving unit and a second electrode positioned at an upper portion of the first organic light emitting layer, and the second emitting diode comprises a third electrode positioned at a lower portion of the second organic light emitting layer and a fourth electrode positioned at an upper portion of the second organic light emitting layer and electrically connected with the second driving unit.

4. The display of claim 3, wherein the fourth electrode is a transflective electrode.

5. The display of claim 4, wherein the first and third electrodes are anodes, the second and fourth electrodes are cathodes, and the second and third electrodes electrically contact with each other.

6. The display of claim 4, wherein the first and third electrodes are anodes, the second and fourth electrodes are cathodes, and an insulation layer is positioned between the first and second emitting diodes.

7. The display of claim 1, wherein the first electrode electrically connected with the first driving unit is positioned at the first organic light emitting layer, the second electrode electrically connected with the second driving unit is positioned at the upper portion of the second organic light emitting layer, and the third electrode is positioned between the first and second organic light emitting layers.

8. The display of claim 7, wherein the first and second electrodes are anodes, and the third electrode is a cathode.

9. The display of claim 7, wherein the first electrode is an anode, the second electrode is a cathode, and the third electrode comprises a matal having a low work function, a surface opposing the second emitting layer in the third electrode is surface-treated.

10. The display of claim 9, wherein the surface treatment is one selected from the group consisting of a mechanical treatment, a chemical treatment, a plasma treatment, and a laser treatment.

11. The display of claim 1, wherein the second driving unit is positioned on the first driving unit.