ORGANIC LIGHT EMITTING DIODE DISPLAY AND METHOD OF MANUFACTURING THE SAME

• US 20100140649A1
• Filed: 12/09/2009
• Published: 06/10/2010
• Est. Priority Date: 12/10/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Soon-Ryong, Kwak, Noh-Min, Jeong, Hee-Seong, Jung, Woo-Suk, Jeong, Chul-Woo, Lee, Joo-Hwa, Kim, Eun-Ah, Jeon, Hee-Chul
• Granted Patent: US 8,247,819 B2
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/8051 Anodes
• CPC Class Codes: H10K 59/80524 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light

Abstract

An organic light emitting diode display includes a substrate member, a plurality of pixel electrodes formed on the substrate member, an organic emission layer formed on the pixel electrodes, and a first common electrode formed on the organic emission. A transmitting layer may be formed on the first common electrode and is configured to be substantially antireflective. A second common electrode may be formed on the transmitting layer and the first common electrode is electrically connected with the second common electrode.

Claims

1. An organic light emitting diode display, comprising:

a substrate member;

a plurality of pixel electrodes formed on the substrate member;

an organic emission layer formed on the plurality of pixel electrodes;

a first common electrode formed on the organic emission;

a transmitting layer formed on the first common electrode and configured to be substantially antireflective; and

a second common electrode formed on the transmitting layer, wherein the first common electrode is electrically connected with the second common electrode.

2. The organic light emitting diode display of claim 1, wherein the transmitting layer comprises a plurality of common contact holes that expose a portion of the first common electrode.

3. The organic light emitting diode display of claim 2, wherein the second common electrode is connected with the first common electrode through the common contact holes of the transmitting layer.

4. The organic light emitting diode display of claim 1, wherein the common contact holes of the transmitting layer are disposed between the pixel electrodes.

5. The organic light emitting diode display of claim 1, further comprises a pixel defining layer formed on the substrate member in between the plurality of pixel electrodes, wherein the first common electrode, the transmitting layer, and the second common electrode are formed on the plurality of pixel electrodes and the pixel defining layer.

6. The organic light emitting diode display of claim 5, wherein the common contact holes of the transmitting layer are formed in the pixel defining layer.

7. The organic light emitting diode display of claim 1, wherein at least one of the first common electrode and the second common electrode is formed of a translucent layer.

8. The organic light emitting diode display of claim 7, wherein the translucent layer comprises at least one of magnesium (Mg), silver (Ag), calcium (Ca), lithium (Li), chromium (Cr), and aluminum (Al).

9. The organic light emitting diode display of claim 1, wherein the first common electrode has a reflective index of about 0.5 or less.

10. The organic light emitting diode display of claim 1, wherein the thickness and refractive index of the transmitting layer is determined by the formula

d=λ

/4 ndcos θ

,

wherein d is the thickness of the transmitting layer, λ

is wavelength of reflected light, n is the refractive index of the transmitting layer, and θ

is an incident angle of light on the transmitting layer.

11. The organic light emitting diode display of claim 1, wherein the second common electrode has a reflective index of about 0.3.

12. The organic light emitting diode display of claim 1, wherein the light emitted from the organic emission layer is not substantially internally reflected by the first common electrode and the second common electrode.

13. A method of manufacturing an organic light emitting diode display, the method comprising:

forming a plurality of pixel electrodes spaced apart on a substrate member;

forming an organic emission layer on the pixel electrode;

forming a first common electrode on the organic emission layer;

forming a transmitting layer on the first common electrode;

forming a plurality of common contact holes that expose a portion of the first common electrode in the transmitting layer; and

forming a second common electrode on the transmitting layer to be connected with the first common electrode through the common contact holes.

14. The method of claim 13, wherein the common contact holes of the transmitting layer are disposed between the pixel electrodes.

15. The method of claim 13, further comprises forming a pixel defining layer between the plurality of pixel electrodes, wherein the first common electrode, the transmitting layer, and the second common electrode are formed on the plurality of pixel electrodes and the pixel defining layer.

16. The method of claim 15, wherein the common contact holes of the transmitting layer are formed on the pixel defining layer.

17. The method of claim 13, wherein the common contact holes of the transmitting layer are formed by a photolithography process.

18. The method of claim 13, wherein at least one of the first common electrode and the second common electrode is formed of a translucent layer.

19. The method of claim 18, wherein the translucent layer comprises at least one of magnesium (Mg), silver (Ag), calcium (Ca), lithium (Li), chromium (Cr), and aluminum (Al).